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    Thread: magnaflow muffler sizing

    1. Member
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      05-13-2012 03:54 PM #1
      Im going to replace my rear muffler with a magnaflow muffler. The one that magnaflow uses for the jetta catback is 5x8x14. I was thinking about a 5x8x18 after hearing that the longer the muffler the deeper the sound. What do you guys think? Also, will replacing just the rear make a difference in sound? Should I replace the mid muffler too? I was going to get the magnaflow catback, but cant justify spending that much (also, dont have that much) for a catback exhaust that is only like .2" bigger in diameter. thoughts? any help is appreciated.

    2. Member kueckerdj09's Avatar
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      05-13-2012 05:55 PM #2
      Mine is a 4x9x14, fits really well in the stock location. I believe the part no. is 11226. I just added a tip on the end of it. You probably won't notice a whole lot of sound unless you do a mid muffler delete and run pipe in between to the muffler.

      honestly from my experience, I would have saved for a catback if I could do it over. i've spent so much on changing to find the sound I want and now i'm changing it again this season.

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      05-13-2012 06:01 PM #3
      I agree I dont want to keep changing it up, but if I put on 2 magnaflow mufflers according to their specs, isnt it basically the same thing as their $600+ catback? Except for the .14" difference?

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      05-13-2012 06:58 PM #4
      also, if I get the 2.5" inlet, do i mate this to the stock piping? I was planning on just clamping it, but will I have to take it to be welded? or will fit?

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      05-13-2012 09:00 PM #5
      anyone? I plan to do this tomorrow.

    6. Member kueckerdj09's Avatar
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      05-14-2012 09:41 AM #6
      Get it welded. Looks cleaner and less chance of exhaust leaks


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      05-14-2012 10:29 AM #7
      ok. should i replace both mufflers?

    8. Member SmithersSP's Avatar
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      05-14-2012 10:30 AM #8
      I'd recommend this guy. It's what I used:
      MagnaFlow 14816 Street Series Polished Stainless Steel Oval Muffle

      Here's my exhaust thread:
      http://forums.vwvortex.com/showthrea...om-GLI-Exhaust
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      Quote Originally Posted by jhines_06gli View Post
      I fix Pete's car to keep cold, cheap beer flowing for the club at shows.

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      05-14-2012 10:34 AM #9
      but dont I need an offset inlet? I was under the car and the stock inlet is more towards the passenger side of the muffler and not centered.

    10. Member SmithersSP's Avatar
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      05-14-2012 10:58 AM #10
      I didn't. I can't remember if I had to mod the factory pipe or not. You will need to fab a hanger for the exhaust.
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      Quote Originally Posted by jhines_06gli View Post
      I fix Pete's car to keep cold, cheap beer flowing for the club at shows.

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      05-14-2012 11:29 AM #11
      I was just going to do this myself, but am i better off just taking it to a shop for any customfab?

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      05-14-2012 11:32 AM #12
      also, for that price I'd rather buy the muffler and tips separate. I found the same muffler (no tips) for $70 and tips for around $35-50.

    13. Member firstorbit84's Avatar
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      05-14-2012 12:28 PM #13
      Quote Originally Posted by JGervs1102 View Post
      I was just going to do this myself, but am i better off just taking it to a shop for any customfab?
      Yes, take it to a shop, and get it welded.

      You may want to go get quotes from local shops for them supplying the parts and doing the work, and for them just doing the work with your parts.
      "If your car 'feels like it's on rails,' then you're going too slow."

    14. Member SmithersSP's Avatar
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      05-14-2012 02:45 PM #14
      Quote Originally Posted by JGervs1102 View Post
      also, for that price I'd rather buy the muffler and tips separate. I found the same muffler (no tips) for $70 and tips for around $35-50.
      I dunno man. Welding stainless can be tricky business (TIG). Unless off course the two pieces you are welding together are standard steel. I would buy the hole thing as one piece if you're only going to save ~$20 in materials.
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      Quote Originally Posted by jhines_06gli View Post
      I fix Pete's car to keep cold, cheap beer flowing for the club at shows.

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      05-14-2012 07:06 PM #15
      should i get 2.5" inlet so it can slide over stock? or 2.25 so itr can slide in?

    16. Member firstorbit84's Avatar
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      05-14-2012 08:05 PM #16
      Quote Originally Posted by JGervs1102 View Post
      should i get 2.5" inlet so it can slide over stock? or 2.25 so itr can slide in?
      2.25" will be smaller than stock. Get 2.5" or 3" if you want to upgrade the rest of the exhaust later
      "If your car 'feels like it's on rails,' then you're going too slow."

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      05-14-2012 08:42 PM #17
      so 2.5" should slide over the existing tubing?

    18. Member firstorbit84's Avatar
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      05-14-2012 10:18 PM #18
      I don't know for sure. Take it to a shop a they'll make it fit
      "If your car 'feels like it's on rails,' then you're going too slow."

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      05-14-2012 10:25 PM #19
      going tomorrow to see what they say. I think Im going to delete the mid muffler and put a 5x8x14 magnaflow out back. Will it be too loud?

    20. Member firstorbit84's Avatar
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      05-14-2012 10:34 PM #20
      The mid muffler is a resonator and it is there to reduce drone. Without it it will be louder and probably have some drone at a specific frequency in a certain rpm range.

      Depending on the motor and the rear muffler, this drone may sometimes be less noticable or not in a normal cruising rpm range, or worst case it will be right at your highway rpm range and a low frequency = very annoying.

      I personally would leave the resonator, or at least replace it with a performance resonator or glass pack
      "If your car 'feels like it's on rails,' then you're going too slow."

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      05-15-2012 11:13 AM #21
      im probably going to replace it with a magnaflow.

    22. Member AKdub914's Avatar
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      05-15-2012 11:23 AM #22
      i have a magnaflow set up and love it. cut all the suitcase mufflers and replace the resonator with a good one. i perfer vibrance performance. have the magnaflow muffler welded on the back and youre golden
      AKdub | I NY * Now in Dallas TX | THREE.8.WERKS...Ferdinand's Crew | Wheel Build | IG: @AKrapheal

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      05-15-2012 11:24 AM #23
      keep resonator delete muffler

    24. Member AKdub914's Avatar
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      05-15-2012 11:29 AM #24
      Quote Originally Posted by alexj87 View Post
      keep resonator delete muffler
      AKdub | I NY * Now in Dallas TX | THREE.8.WERKS...Ferdinand's Crew | Wheel Build | IG: @AKrapheal

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      05-15-2012 06:25 PM #25
      Akdub so you are saying vibrant resonator and magnaflow muffler with sound good? Went to the shop today, $100 to weld on muffler and res or 125 to weld on muffler and delete res. a little steep I think.

    26. 05-15-2012 07:45 PM #26
      (ignore the routing under the LCR)

      This is the magnaflow muffler and tip setup that I have. Sounds good, not annoying or overbearing.


    27. Member firstorbit84's Avatar
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      05-15-2012 08:40 PM #27
      Quote Originally Posted by JGervs1102 View Post
      Akdub so you are saying vibrant resonator and magnaflow muffler with sound good? Went to the shop today, $100 to weld on muffler and res or 125 to weld on muffler and delete res. a little steep I think.
      Yeah, super steep if they are just welding your parts. I would only pay $50-$75 for that work tops.

      See if any local shops sell magnaflow and will give you a deal on the muffler plus install if you buy the parts from them.
      "If your car 'feels like it's on rails,' then you're going too slow."

    28. Member kueckerdj09's Avatar
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      05-16-2012 12:08 PM #28
      Quote Originally Posted by firstorbit84 View Post
      Yeah, super steep if they are just welding your parts. I would only pay $50-$75 for that work tops.

      See if any local shops sell magnaflow and will give you a deal on the muffler plus install if you buy the parts from them.
      I tried doing that. shop couldn't give me any kind of deal even if I was buying the muffler and tip from them. they said it was cheaper to buy one myself online somewhere and then come back to have them do it.

      price wise, i'd shop around more and see if you can get some competing bids

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      05-16-2012 12:36 PM #29
      yea they sound really good together.. nice tone not loud and raspy. i do think that pricing is a little steep just for a cut and weld

      found a thread i posted in with soundclips along with dubsessed setup
      http://forums.vwvortex.com/showthrea...7565-2.5-sound

      AKdub | I NY * Now in Dallas TX | THREE.8.WERKS...Ferdinand's Crew | Wheel Build | IG: @AKrapheal

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      05-16-2012 08:23 PM #30
      ok now keep in mind i have the 2.0T and you have the 2.5. Probably would change quite a bit right?

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