Originally Posted by
saxon
You won't see any noticeable power difference between any of the catted down pipes available on the market. Epl had/has? a relationship with ams which is most likely why they recommend their parts. ( don't get me wrong, the ams parts are to notch but in this situation your just paying for the name and not for any additional performance or features)
Disagree, all those catted dp have different design and there is a reason why I paid (discounted) shipping cost of $500 USD to Australia for the APR cast dp.
I am sure most people will agree AMS & APR has the better air flow design compare to cross section of Milltek/Unitronic due to their dp is straight downward. I been told curve or bent you on the piping you lose HP.
AMS & APR both also used the best available GESI cat which is rated 500hp per side and will provide smooth power up to 1000hp. Milltek/Unitronic uses unknown brand which doesn't specify max power output, EPA certified, warranty and capability of withstand up to x degree.
What made me choose APR over AMS is due to the fact that their cat is near the mid pipe which have the benefit of cooler air=more power because cat is further away from the engine which generate less heat compare to AMS which is right behind the turbo.
Cat in the dp is better for emissions. Dp is hotter therefore burns cleaner
Cat further down stream of the exhaust is better for flow ie performance
Cat is also a muffler so further away will increase the exhaust volume
I don't have comparison between APR vs AMS however I do have APR vs Milltek.
My mate who did the same APR stage3 as me with RS7 turbo on S7, same 265 pilot super sport running Milltek catted dp tire ran 11.33@124mph which is clearly lower than my APR dp 11.15@127
All the mods are the same exact dp
Below is his clip
https://www.youtube.com/watch?v=FcTg21LhI9s
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