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      01-02-2013, 12:15 AM   #18
PR3CI5N
need4speed
 
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Drives: 2010 E90 M 335i
Join Date: Jun 2010
Location: West Coast

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Actually my BMW PE replaces the midpipes which contains resonators so its a little more than just a "muffler" system. Guarantee with my mods my exhaust added 10+hp



Quote:
Originally Posted by idrift4wd View Post
Just think about it this way. PE are just mufflers. all the way at the end of the exhaust. Its very hard to see how the engine itself can make more power with a different muffler. Axle-back exhaust tend to just change the note of the engine and allows for slightly better exhaust flow, but its to a small point where the engine itself cant see the benefits of it. all cars technically dont need back pressure. Only reason they are there is to make sure your car abides by the law. Your car can sound really good, but make the same amount of hp. On a good day, you'll see 1-2 HP to the wheels. so maybe 3-4hp to the crank.

But its a great exhaust, the exhaust note is great but dont expect much HP.
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