TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

To all hi-flow catalyst owner, your advise! -->

Old 09-03-2003, 11:44 PM
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Default To all hi-flow catalyst owner, your advise! -->

In simple words please, what actually is the benefit of the hi-flow cat to the stock cat and what other mods it has to go with in order to max. output? Cheers
Old 09-03-2003, 11:53 PM
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Default Supposed to raise top-end horsepower but some say that you may lose low-end torque as a result

Not sure on either claim. I think if your car has a stage 3 turbo then it's a nice addition but otherwise it's no necessity. Although it may not be the most unbiased source of info on this, Pete or someone else at Stratmosphere would be good to ask about this part.
Old 09-04-2003, 03:13 AM
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you dont need it....
Old 09-04-2003, 05:29 AM
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Default Only on stage 3.

Stock exhaust manifold and downpipe restrict more flow than the cat.
Old 09-04-2003, 07:48 AM
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what do you mean?
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