new to turbo - quick Q??
#1
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ok...so i have a '03 A4 1.8Tq....the question is what are the pro's and con's to taking out the CAT. and putting in a downpipe/test pipe in place of it, are there any back pressure issues, or anything i would have to worry about?? for now i am running a stock exhaust system, but i think my CAT. is starting to get clogged up, i live in FL where there are no emmission tests (is that correct spelling??) so that doesn't matter to me... let me know.
TIA,
Joe
TIA,
Joe
#2
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Get a testpipe, you won't be disappointed!
Advantages: More power, turbo spools faster, cheaper then replacing with new cat
Disadvantages: CEL may come on (I use the non-fouler mod and I dont get a CEL), some people notice a smell, but I have no problems
Also, the exhaust will be somewhat louder (could be a plus or minus depending on preference)
Advantages: More power, turbo spools faster, cheaper then replacing with new cat
Disadvantages: CEL may come on (I use the non-fouler mod and I dont get a CEL), some people notice a smell, but I have no problems
Also, the exhaust will be somewhat louder (could be a plus or minus depending on preference)
#5
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I believe with certain chips like REVO it prevents the CEL to come on. in a few weeks im going to get an EVO TP..custom downpipe..380cc injectors and REVO put in..and i have emissions in my state... also many states dont do the smeller test or visuals really anymore..they just plug into the ecu and read if there are any codes..
#6
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ok..so yea (JOVIAN)...like i said...i live if florida so i dont have to deal with emmissions tests!! if you can read!! And also what can i get so i dont have a problem with the CEL light because of the after CAT. O2 sensor??
TIA,
Joe
TIA,
Joe
#7
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All you need to do is put 2 spark plug non-foulers in before the post-cat o2 sensor and it should prevent the cel from coming on. The non-foulers only cost a few dollars at autozone or something. I've been doing this for several months now with no CEL.
![](http://home.comcast.net/%7Eericmattila/misc/tp_007.jpg)
![](http://home.comcast.net/%7Eericmattila/misc/tp_007.jpg)
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