Does a Catless Downpipe Make More Power Than a Catted Downpipe? Audi B9 S4

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When you're making nearly 600hp in an Audi B9 S4, do you need a catless downpipe to make sure you are getting every last drop of performance? In this video I did a back to back comparison of a catless downpipe vs a catted downpipe while using a TTE810 running Integrated Engineering Stage 3+ 93 octane software. The results were TRULY unexpected! Enjoy!

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