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    Thread: Cat-less vs Catted

    1. Member ShutItDown's Avatar
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      05-03-2009 09:42 PM #1
      Some interesting information on test pipe vs cat. Would be useful when looking for a ATP cat-less DP vs catted DP's.
      http://evoempire.org/Test-Pipe...rplus
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    2. Member Josein06GLI's Avatar
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      05-04-2009 12:37 AM #2
      my boy has a apr downpipe and i have the atp catless. neither one of us have software and we both have dsg and i pull on him a little bit, its a straight pipe, also maybe its just me, i think the car warms up quicker in the mornings.
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    3. Member wazzap1101's Avatar
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      05-04-2009 03:32 PM #3
      the bottom line is the catted is more restrictive than non-catted.
      WIth a cat, you're sacrificing performance to pass inspection and be more environmentally friendly. It all depends if your willing to make the tradeoff, and personal preference.
      BTW, nice info ShutItDown

    4. Member ShutItDown's Avatar
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      05-04-2009 09:42 PM #4
      Quote, originally posted by wazzap1101 »
      the bottom line is the catted is more restrictive than non-catted.
      WIth a cat, you're sacrificing performance to pass inspection and be more environmentally friendly. It all depends if your willing to make the tradeoff, and personal preference.
      BTW, nice info ShutItDown

      No problem. Everyone know a cat is more restrictive but all these high flow 100 cell cats that claim to be the same performance as test pipe set up and this is some good information against it.
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    5. 11-12-2009 07:42 PM #5
      i run an ebay DP with a magnaflow 200cell cat..i did it mainly to pass emissions but i did notice the power and the sounds mated to the stock exhaust is much nicer than i expected

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      11-13-2009 09:21 AM #6
      I run a cat with my GT3582R

    7. Member SmithersSP's Avatar
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      11-13-2009 10:21 AM #7
      Quote, originally posted by MK3Serge »
      i run an ebay DP with a magnaflow 200cell cat..i did it mainly to pass emissions but i did notice the power and the sounds mated to the stock exhaust is much nicer than i expected

      I have the same setup. It wasn't that I needed it to pass inspection, or that I'm a treehugger; more so that I got sick of the ass end of my GLI smelling of raw unspent fuel... While I doubt my car would pass a comprehensive emissions test the cat takes car of the fuel smell...
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    8. Member bostonaudi1's Avatar
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      11-13-2009 05:56 PM #8
      Quote, originally posted by wazzap1101 »
      the bottom line is the catted is more restrictive than non-catted.
      WIth a cat, you're sacrificing performance to pass inspection and be more environmentally friendly. It all depends if your willing to make the tradeoff, and personal preference.
      BTW, nice info ShutItDown

      BS
      Sure, but somehow Porsche, Corvette and many others can extract 400+ hp easily with cats in place. You're "sacrificing" almost NO performance with a high flow cat, and performing the completely selfish act of trashing the air for EVERYONE else when removing it.
      I ME MINE




      Modified by bostonaudi1 at 5:58 PM 11-13-2009
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    9. 11-16-2009 11:25 AM #9
      Quote, originally posted by SmithersSP »
      It wasn't that I needed it to pass inspection, or that I'm a treehugger; more so that I got sick of the ass end of my GLI smelling of raw unspent fuel...

      same here. that ish stunk

    10. Member Josein06GLI's Avatar
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      11-16-2009 05:23 PM #10
      i have an atp catless DP nd i love it cuz it was 300 bucks and mainly cheaper cuz it doesnt have a cat, a catted DP runs upwards of like 500-900 depending on what brand, catless for me, who cares what it smells like, get chipped and u wont even need a spacer for u catless dp guys
      2006 BMP VW JETTA GLI DSG some coils, some bolt ons and some wheels.
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    11. Member SmithersSP's Avatar
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      11-16-2009 06:08 PM #11
      I couldn't help but notice you live in SD. If you don't mind me asking; how do you pass a smog check?
      Thanks!
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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.

    12. Member ShutItDown's Avatar
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      11-16-2009 08:53 PM #12
      How often do you have to check your car? I would assume he would just put the other one on before he has to check it.
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    13. Member Josein06GLI's Avatar
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      11-17-2009 02:05 PM #13
      well in cali the car isnt due for smog until its 6 years old, my GLI is an 06 so its due for its first smog in 2012, at which point i WILL NOT own the car anymore and if i do theres places to get it done "under the rug" using a dummy car
      2006 BMP VW JETTA GLI DSG some coils, some bolt ons and some wheels.
      1989 VW GTI 2.8l VR6 some coils, some bolt ons, and some wheels.
      2012 Audi all stock, its hers. she dont want me messing with it...yet.

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      11-17-2009 02:24 PM #14
      Quote, originally posted by Josein06GLI »
      well in cali the car isnt due for smog until its 6 years old, my GLI is an 06 so its due for its first smog in 2012, at which point i WILL NOT own the car anymore and if i do theres places to get it done "under the rug" using a dummy car

      Wow 6 years... and people complain about smog in california? Even here in Georgia they do it after 2 years.. NJ was 4 years on new car and some states are even 1 year. I think NC smogs cars before they are delivered to the dealers..

    15. 11-17-2009 03:21 PM #15
      Quote, originally posted by bostonaudi1 »
      BS
      Sure, but somehow Porsche, Corvette and many others can extract 400+ hp easily with cats in place. You're "sacrificing" almost NO performance with a high flow cat, and performing the completely selfish act of trashing the air for EVERYONE else when removing it.
      I ME MINE
      Modified by bostonaudi1 at 5:58 PM 11-13-2009

      You said: "Porsche, Corvette and many others can extract 400+ hp easily with cats in place". I say Yea, but do you realize what kinda power those cars would have if they had the cats removed? It would blow your mind, You'd be shocked @ how much more power they'd have. That is why I choose to run the ATP.
      Sold the VAG COM

    16. Senior Member MFZERO's Avatar
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      11-17-2009 03:25 PM #16
      it's an age old battle.
      p.s. the first link doesn't work

    17. Member Krieger's Avatar
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      11-17-2009 03:29 PM #17
      that honeycomb in a cat will not rob u of much power.
      even in turbo charged cars ur really only gonna gain a VERY minimal amount of ponies over a catted pipe... and the difference is even less on a N/A engine as they need back pressure to keep the exhaust flowing right and maintain the exhaust pulse and velocity as it travels down the system.

      i run catless, but as soon as i get around to it, imma hack up my pipe and weld in a nice metallic cat, i will then dyno my car again and prove to u that just like all the other cars ive ever worked on, this one wont lose much, if any at all, horsepower or torque just because a thin catalytic material happens to be in the system...
      2006 Audi A3 | 2.0T | 6MT | APR Stage 2+ | Fully loaded ECU | FK grill | EJ CAI | BSH TBP |EJ DV Reloc. | Eurojet TBE | EuroJet Catch Tank | Cross drilled and Slotted Rotors | EBC "Redstuff" Kevlar | Raceland Coilovers | Forge Side to Side Short Shifter | Forge Front to Back Short Shifter | Devil's Own DVC-30 Methanol injection | BSH RSB | BSH Motor mount Kit | 42 DD Shifter Bushings | HPFP Stage 1 upgrade |

    18. 11-17-2009 04:29 PM #18
      In high school (1991) my buddy had (& still has) a 1988 Monte Carlo SS. He put a 400whp - 383 Stroker in it w/Dart heads & a 750cfm carb. Art Carr Transmission with 4.10 grears in the rear
      The car had a custom dual exhaust installed consisting of two, 2.5" pipes leading into "2 chamber" (loud as hell) Flowmaster mufflers & that was it. It was a friggin beast.
      One day we got pulled over & the cop actually went down on his hands & knees & looked at his exhaust. Thus busting him for no cats. So he went back to the exhaust shop & had them weld in to high flow race cats & afterwards I drove the car. The diffeerence was night & day.
      Before the cats were put on, the car hauled ass during the mid range & top end it was incredible. After the cats were installed it lost ALL of that. Now down low it was a torque monster, but the midrange & top end were non exsistant compared to before.


      Modified by rippie74 at 4:31 PM 11-17-2009
      Sold the VAG COM

    19. Member SmithersSP's Avatar
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      11-17-2009 05:02 PM #19
      I'm neutral in this debate so I'm just asking for curiosity sakes; what type of cats were they? Were they standard oem-ish cats or low cell count metallic spun cats?
      Thanks!
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      Quote Originally Posted by jhines_06gli View Post
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    20. Member Josein06GLI's Avatar
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      11-17-2009 11:33 PM #20

      i run catless, but as soon as i get around to it, imma hack up my pipe and weld in a nice metallic cat, i will then dyno my car again and prove to u that just like all the other cars ive ever worked on, this one wont lose much, if any at all, horsepower or torque just because a thin catalytic material happens to be in the system...
      i know u said u were running catless dp, why would u want the risk possibility of losing any if any horsepower or torque ????
      2006 BMP VW JETTA GLI DSG some coils, some bolt ons and some wheels.
      1989 VW GTI 2.8l VR6 some coils, some bolt ons, and some wheels.
      2012 Audi all stock, its hers. she dont want me messing with it...yet.

    21. Member Krieger's Avatar
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      11-18-2009 10:17 AM #21
      because if this car is like any other turbo charged car ive ever played with or worked on, the losses will be negligible.
      and if u can feel the loss of like 4 or 5 HP, ur a freak. lmao
      this car runs SUPER rich, so if i catch a wiff of my car's a$$ fumes, it brings a tear to my eye cuz it actually stings when u breath and ****. lol
      2006 Audi A3 | 2.0T | 6MT | APR Stage 2+ | Fully loaded ECU | FK grill | EJ CAI | BSH TBP |EJ DV Reloc. | Eurojet TBE | EuroJet Catch Tank | Cross drilled and Slotted Rotors | EBC "Redstuff" Kevlar | Raceland Coilovers | Forge Side to Side Short Shifter | Forge Front to Back Short Shifter | Devil's Own DVC-30 Methanol injection | BSH RSB | BSH Motor mount Kit | 42 DD Shifter Bushings | HPFP Stage 1 upgrade |

    22. 11-18-2009 11:16 AM #22
      You guys with the ebay DP's and cats. What did you do, buy the ebay DP, then have an exhaust guy weld in the cat? Is the cat in the DP or somewhere downstream in your exhaust?

      Could I use one of, or both of the stock cats with the ebay DP and expect good results, or do I need to get a better flowing cat?
      Thanks
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    23. Member Krieger's Avatar
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      11-18-2009 11:22 AM #23
      stock cats are small, thick, and super restrictive.
      i have an ebay pipe cuz it works, but im gonna get a 200 cell metallic cat. might be from magnaflow, but i like random technology too.
      2006 Audi A3 | 2.0T | 6MT | APR Stage 2+ | Fully loaded ECU | FK grill | EJ CAI | BSH TBP |EJ DV Reloc. | Eurojet TBE | EuroJet Catch Tank | Cross drilled and Slotted Rotors | EBC "Redstuff" Kevlar | Raceland Coilovers | Forge Side to Side Short Shifter | Forge Front to Back Short Shifter | Devil's Own DVC-30 Methanol injection | BSH RSB | BSH Motor mount Kit | 42 DD Shifter Bushings | HPFP Stage 1 upgrade |

    24. Member SmithersSP's Avatar
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      11-18-2009 11:26 AM #24
      I bought my catless DP and magnaflow 200 cell cat off ebay. I have a shop weld in the cat. To be honest I didn't notice any difference in the power of the car. I didn't do a pre/post dyno though so who knows for sure...
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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.

    25. Member Krieger's Avatar
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      11-18-2009 11:42 AM #25
      yeah, you wont. your turbo is still gonna be spooling like a beast simply because you got rid of that first cat that was like a brick wall, plus gave it PLENTY of room to flow afterwards. it's not like the honeycomb of a cat is such a huge restriction... ****, most flow more than alot of mufflers.... so if u dont notice a drop in power from a muffler, why would u from a cat?
      100 cell metallic

      200 cell

      neither will block much flow at all... they are far back enough in the exhaust that your turbo will see almost no build up in back pressure... Now, if u went with a much bigger turbo that could move alot more exhaust, faster, u might lose more, but with a K03 or K04, ur not gonna choke up the system.
      2006 Audi A3 | 2.0T | 6MT | APR Stage 2+ | Fully loaded ECU | FK grill | EJ CAI | BSH TBP |EJ DV Reloc. | Eurojet TBE | EuroJet Catch Tank | Cross drilled and Slotted Rotors | EBC "Redstuff" Kevlar | Raceland Coilovers | Forge Side to Side Short Shifter | Forge Front to Back Short Shifter | Devil's Own DVC-30 Methanol injection | BSH RSB | BSH Motor mount Kit | 42 DD Shifter Bushings | HPFP Stage 1 upgrade |

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