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    Thread: Custom Exhaust : It Begins

    1. Member Draxus's Avatar
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      04-02-2011 09:42 PM #106
      The downpipes / headers are staying stock for now.

      Next project is making some headers. This summer I will probably start on that.
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    2. Member Draxus's Avatar
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      04-11-2011 04:06 AM #107
      So its on...

      We just have it turned down right after the rear diff right now. Cattless to single Burns muffler.

      On the Burns Muffler... I took it apart to get a feel for what I paid. I am never going to buy one again. Not fantastic inside.

      Anyway.

      It is so loud that it clips my camera mic. I am needing another muffler. It sounds great, except for the level of it. On the way back from SCCA (where it sounded aweeeesome on the track), we stopped and got some ear plugs.

      It is about as street legal as beating your wife with a golf club at The Olive Garden.

      1-2k RPM is ok.
      2-3k RPM DANGER ZONE. (drone for days)
      3k+ Formula 1 car.

      It's sick if your on it but it is just a pain around town. Really took a lot of fun out of the car. But, that was expected as... its a damn single muffler.

      Sound:

      At idle: V8 mustang

      Around town: Uuuh, T-rex?

      On it: So, imagine Chewbacka just got back to his home to find it burned down and his wife and kids hung from the tree in his front yard and then him falling to the ground and letting out a blood chilling yell to the gods.

      .....yeaaaaa.


      Vibrant Muffler vs Magnaflow

      What size exhaust tip? 4" or 4.5"

      Best place to get said tip?

      Thanks.
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    3. 04-11-2011 05:47 AM #108
      Car: MKV R32 T STAGE III
      Exhaust few days back: 3" downpipe > 2x 100 cell cat > 3.5" pipe > stright tru maffler > 3.5" pipe > stright tru maffler

      Result: same as your mate. Hate it! 1500-3000 = major drone, 3000rpm onwards F1 on boost.

      Coming back to the shop to fit spiral muffler + replase one stright thru with baffled muffler.

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      04-11-2011 09:07 AM #109
      Quote Originally Posted by Draxus View Post

      Vibrant Muffler vs Magnaflow
      What about a Borla Turbo Muffler?
      "Being in space was great, I had plenty of time to rub one out, which in space is great, but after a while it's like living in a snow globe" -Peter Griffin
      "You could whore yourself out to 1,000 fat chicks for $50 apiece. Or 50 really fat chicks for $1,000. What? Don't look at me like that. Fat chicks need love too. But, they got to pay." -Glenn Quagmire

    5. Member nkgneto's Avatar
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      04-11-2011 11:58 AM #110
      I'd be interested to see the Vibrant muffler. It is one of my options as soon as my high flows go on.

    6. Member Draxus's Avatar
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      04-11-2011 12:37 PM #111
      Quote Originally Posted by CaptainQualude View Post
      What about a Borla Turbo Muffler?
      What is good about them?
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    7. Member R32R1's Avatar
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      04-11-2011 02:07 PM #112
      Loving the descriptions lol

    8. Member BOUDAH's Avatar
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      04-11-2011 02:21 PM #113
      Quote Originally Posted by Draxus View Post
      So its on...


      It is about as street legal as beating your wife with a golf club at The Olive Garden.
      LMFAO.....
      Instagram- @eboudah

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      04-11-2011 03:36 PM #114
      Quote Originally Posted by Draxus View Post
      What is good about them?
      Good flow with reasonable sound control.
      "Being in space was great, I had plenty of time to rub one out, which in space is great, but after a while it's like living in a snow globe" -Peter Griffin
      "You could whore yourself out to 1,000 fat chicks for $50 apiece. Or 50 really fat chicks for $1,000. What? Don't look at me like that. Fat chicks need love too. But, they got to pay." -Glenn Quagmire

    10. Member Det. John Kimble's Avatar
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      04-11-2011 05:38 PM #115
      Quote Originally Posted by R32R1 View Post
      Loving the descriptions lol


      I second that


    11. 04-12-2011 12:22 AM #116
      Quote Originally Posted by Draxus View Post
      So its on...

      We just have it turned down right after the rear diff right now. Cattless to single Burns muffler.

      On the Burns Muffler... I took it apart to get a feel for what I paid. I am never going to buy one again. Not fantastic inside.
      The Burns mufflers are only meant to take off a few db. The primary goal of the Burn's mufflers is to have a re packable muffler that is super lightweight.

      The turns downs, especially being so close the rear axle are probably contributing greatly to the drone. You should try directing the exhaust out the back before you swap out mufflers.

      If you want to record it, try rubber banding a cotton ball in front of the mic when recording. That will greatly help to reduce chatter noise.

    12. Member Draxus's Avatar
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      04-12-2011 01:28 AM #117
      Here is a video taken from about 150 yards back from my Nexus One cellphone.

      http://vimeo.com/22267636

      Never left second gear.
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    13. Member Draxus's Avatar
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      04-12-2011 01:30 AM #118
      Quote Originally Posted by rex_racer View Post
      The Burns mufflers are only meant to take off a few db. The primary goal of the Burn's mufflers is to have a re packable muffler that is super lightweight.

      The turns downs, especially being so close the rear axle are probably contributing greatly to the drone. You should try directing the exhaust out the back before you swap out mufflers.

      If you want to record it, try rubber banding a cotton ball in front of the mic when recording. That will greatly help to reduce chatter noise.
      That is a good point on the drone.

      Also, I knew it wasn't going to take it down a lot volume wise. I was commenting on the build quality. Looks great on the outside, but the inside is fairly meh. Not bad, or worth complaining about to Burns. But, not worth almost $300.
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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      04-12-2011 03:39 AM #119
      Quote Originally Posted by Draxus View Post
      Here is a video taken from about 150 yards back from my Nexus One cellphone.

      http://vimeo.com/22267636

      Never left second gear.
      Nice vid! But the fog or whatever ruined the video

    15. Member Draxus's Avatar
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      04-12-2011 03:43 AM #120
      I am so scared of picking the wrong muffler and ****ing the sound up.

      Arg.
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    16. Member Cortexiphan's Avatar
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      04-12-2011 08:51 AM #121
      Magnaflow?

    17. Member Sutt's Avatar
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      04-12-2011 11:06 AM #122
      Why not pack the muffler with more material?

    18. Member EMANNvr6's Avatar
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      04-12-2011 02:11 PM #123
      I was laughing in my lab class reading those descriptions haha

      Must sound insane !

    19. Member huichox4's Avatar
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      04-12-2011 02:24 PM #124
      Quote Originally Posted by Draxus View Post
      I am so scared of picking the wrong muffler and ****ing the sound up.

      Arg.
      get a cherry bomb ............................ I might actually do that because my car is obnoxiously loud and I am cheap

    20. Member Draxus's Avatar
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      04-12-2011 02:52 PM #125
      Muffler Question:

      Example muffler as a Borla Turbo.

      How would the sound differ from a oval and round of the same length?

      I would assume that the oval would be quieter due to damping mass, yet how would the oval size effect the sound?

      Anyone know?
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    21. Member Draxus's Avatar
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      04-28-2011 03:39 PM #126
      I am thinking about throwing some cats into it to pick up some low-rpm torque and tone down the frappy rasp-ness.

      Then maybe another burns muffler out the back...

      I have learned how to drive it so it isn't that bad anymore. Still balls loud, but man does it sound good at WOT.
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    22. Member huichox4's Avatar
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      04-28-2011 04:17 PM #127
      Quote Originally Posted by Draxus View Post
      I am thinking about throwing some cats into it to pick up some low-rpm torque and tone down the frappy rasp-ness.

      Then maybe another burns muffler out the back...

      I have learned how to drive it so it isn't that bad anymore. Still balls loud, but man does it sound good at WOT.
      Cats will help quiet it down

    23. Member spitfire481's Avatar
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      04-28-2011 05:57 PM #128
      no tube style muffler i ever had was quiet enough. i had to add a oval cased muffler to make it street-able. dual 2" down pipe to 3" no cat into a magnaflow oval case muffler is just right for me. mine is a 2.8 but it wont be much different. the turndown makes a ton of drone. i had mine under the car about 12" from the bumper and it was horrible. moved the turndown to the very edge of the bumper and just that made a huge difference.

    24. Member Draxus's Avatar
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      04-28-2011 11:13 PM #129
      Quote Originally Posted by spitfire481 View Post
      no tube style muffler i ever had was quiet enough. i had to add a oval cased muffler to make it street-able. dual 2" down pipe to 3" no cat into a magnaflow oval case muffler is just right for me. mine is a 2.8 but it wont be much different. the turndown makes a ton of drone. i had mine under the car about 12" from the bumper and it was horrible. moved the turndown to the very edge of the bumper and just that made a huge difference.
      I am thinking of adding another burns oval and putting it out the back. That will take care of the drone I bet.
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    25. Member Draxus's Avatar
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      04-29-2011 12:26 AM #130
      Just ordered cats and another v-band.

      Cats came to $140 with free shipping.
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    26. 04-29-2011 02:46 AM #131
      Quote Originally Posted by Draxus View Post
      Muffler Question:

      Example muffler as a Borla Turbo.

      How would the sound differ from a oval and round of the same length?

      I would assume that the oval would be quieter due to damping mass, yet how would the oval size effect the sound?

      Anyone know?
      I might know...
      Larger mufflers have more packing material and are generally quieter than a same length round muffler sharing identical muffler core diameters.

    27. Member Draxus's Avatar
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      04-29-2011 02:48 AM #132
      Quote Originally Posted by alvint@borla View Post
      I might know...
      Larger mufflers have more packing material and are generally quieter than a same length round muffler sharing identical muffler core diameters.
      Yes, there will be more of a dB drop, but I was curious about a tone change.
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    28. 04-29-2011 03:29 AM #133
      Quote Originally Posted by Draxus View Post
      Yes, there will be more of a dB drop, but I was curious about a tone change.
      Assuming an identical muffler core design, expect minimal frequency change due to similar exhaust gas velocities.
      In general, expect a drop in sound pressure level (less dB) when changing an oval muffler to a round muffler of the same design.

      Pipe diameter changes affect exhaust gas velocities that can change the exhaust note frequency.

    29. Member Draxus's Avatar
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      05-05-2011 11:19 PM #134
      Two cats came today:

      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    30. Member Cspence's Avatar
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      08-06-2011 02:17 PM #135
      looked through 4 pages only to be dissapointed that there was no video...

    31. Member Draxus's Avatar
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      08-06-2011 05:16 PM #136
      Cats are in. Sounds amazing. Debating just sticking with the single resonator and piping it out the back. I'll try and get a video. No rasp. All deep rawr.
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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    32. Member nkgneto's Avatar
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      08-06-2011 07:06 PM #137
      C'mon this thread is useless with out pics! LOL



      ---
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    33. Member Draxus's Avatar
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      08-06-2011 07:20 PM #138
      Bah! Fiiiiiine. I'll get some. Haha
      Quote Originally Posted by BlownR View Post
      I have seen several open slots, usually after tequila. Wait, I think that's different.
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      08-06-2011 08:37 PM #139
      Wow that really is loud in that clip!

      I guess my turbo helps that much. I have no resonators, and only the 9" like i mentioned earlier and it's very civil when I'm off the throttle. On the throttle, with my external wastegate dump, even with 10 mufflers all bets are off

    35. 08-08-2011 02:12 AM #140
      Quote Originally Posted by simple_man View Post
      Car: MKV R32 T STAGE III
      Exhaust few days back: 3" downpipe > 2x 100 cell cat > 3.5" pipe > straight tru muffler > 3.5" pipe > straight tru muffler

      Result: same as your mate. Hate it! 1500-3000 = major drone, 3000rpm onwards F1 on boost.

      Coming back to the shop to fit spiral muffler + replace one straight thru with baffled muffler.
      My issue is that 3.5 inch with straight thru mufflers for the flow is too loud and there is a major drone at 2300RPM.

      So, experiment 1:
      I had two straight thru mufflers + 20 inches of spiral (think moroso).



      Now added third straight thru muffler after the CAT's and reduced spiral length to 12 inch:



      Result is slight reduction in drone and it's shift to lower RPM, now sit at 2100RPM (left overs). So, as theory tells us, absorption mufflers (high flow type commonly used) do not do much at low frequencies. They suppress 300/600 Hz upwards. Nothing down low where we need it most, about 100Hz. So use of those to help the drone is noneffective. One needs baffled type muffler of CORSA type with branch resonator technology. Those will work much better below 300Hz.

      So, we still have some minor drone that needs to be addressed and a very high flow system that sounds really nice and deep 4000RPM upwards.

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