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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catless DP Questions



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      03-17-2008, 12:04 AM   #1
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Catless DP Questions

What kind of gains will I get with a totally stock exhaust with catless DP's? And does anyone know if any tuning is required?
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      03-17-2008, 12:10 AM   #2
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i haven't read much about gains in that particular setup, but a tune is recommended. Depends on the tuner though, PROcede requires a map to take advantage of it, so does AA. Terry seems to believe that the stock boost control system will adapt accordingly.

here are a few threads to keep you busy.


http://www.n54tech.com/forums/showthread.php?t=320

http://www.e90post.com/forums/showthread.php?t=109317
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      03-17-2008, 12:10 AM   #3
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You will get better throttle response and slight improvment in acceleration, but to fully experience the power gains i'd recommend a cat-back along with it.
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      03-17-2008, 03:56 AM   #4
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total stock numbers are on our site. 30whp and 50wtq on our test car with no tune.
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      03-17-2008, 10:46 AM   #5
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Originally Posted by Adam@Riss Racing View Post
total stock numbers are on our site. 30whp and 50wtq on our test car with no tune.
what about exhaust? stock or not? And cels?
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