A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

how do you put a test pipe on without getting a CEL?

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Old Jan 16, 2008 | 05:57 AM
  #1  
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Default how do you put a test pipe on without getting a CEL?

can't decide if i should put a high flow cat or just a test pipe. what have you guys done what works? if you use a high flow cat what kind?
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Old Jan 16, 2008 | 06:10 AM
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check the FAQ and/or search: fouler
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Old Jan 16, 2008 | 06:23 AM
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Default labree for a HFC

test pipe you can look into the non fouler mod

I do believe a guy on vwvortex makes a 90 degree adapter that you can use to take the 02 sensor directly out of the exhaust gas stream
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Old Jan 16, 2008 | 06:38 AM
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2nd
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Old Jan 16, 2008 | 07:02 AM
  #5  
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what should i use then. High flow or test pipe
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Old Jan 16, 2008 | 07:06 AM
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I also have a awm B5 does that matter for the fouler set up?
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Old Jan 16, 2008 | 07:06 AM
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Default debateable

decide which is more important to you
1) money
2) enviroment

that's about it

if you care about your money... buy a test pipe

if you care about the enviroment get a high flow cat

done and done
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Old Jan 16, 2008 | 07:08 AM
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Default do you have a chip? ..

im reading through your sig.. and i don't see it oh wait it's the first one :P dahlback

shouldn't make a diff.. however i asked about the chip because APR can program that CEL out iirc
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Old Jan 16, 2008 | 07:16 AM
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Default Yes i have the dhalback chip and apr exhaust. hold 20psi.

want to rid of backpressure. what do i do?
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Old Jan 16, 2008 | 07:18 AM
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Default well ... as anyone will tell you .. some backpressure is a good thing

if you remove too much your car will gain up top but lose down low...

on the flipsyde of that argument... i was running a k04 with a test pipe on my 01 with no backpressure (improper tuning though).. and that thing was pretty peppy off the line

then agian the motor blew


so

yeah
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