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      04-15-2013, 01:10 AM   #1
momo3605
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Drives: 328i M Sport
Join Date: Aug 2012
Location: Norcal

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Test Pipes vs Mid pipe vs Rear Section HP gains

Hey guys, so I don't really understand how many different parts to this exhaust there are. And there are like 3 cats as well? Not sure...

All I know is it's way more complicated than my old car's axle back and cat back. So hopefully someone can help me out!

What are the hp gains to be had from modifying these 3 parts and what combination of the 3 would give the biggest gains? Keeping the price to a minimum.

Also, under consideration, which would keep the sound levels low? I've seen a few people change out the midpipe in videos with the stock exhaust and it sounds like a bee's nest!

Thanks!