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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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Old 01-28-2013, 07:36 AM
daytrader daytrader is offline
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Location: VA
 
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Mein Auto: 2010 E92 335i
Question Boost levels; factory intake and exhaust

Hi guys,

A question in reference to our OEM air intakes and exhaust systems. Assuming we tune boost levels upward from factory 8 psi, at what point do the above mentioned start to become restrictive, if at all? I have read up to about 14 is fine, 16 and up is where gains, albeit small ones, can be enhanced with aftermarket performance intakes & exhausts.

Any shared experience would be greatly appreciated, thanks.
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Old 01-28-2013, 10:13 AM
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bear-avhistory bear-avhistory is offline
2014 435M-Sport/MPPK
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Mein Auto: 2014 435M-Sport/MPPK
I am not convinced on the value of intakes except for very high boost cars but 17PSI seems to be a good crossover point to get downpipes. Exhausts at the end od the stream (mufflers) don't really do much of anything but do sound nice in a lot of cases. My car without intake or downpipes is tuned for 16.5psi max with a safety setting of 17psi. At my settings downpipes should add 15-20WHP but with the car under warranty the hassle & smell are not worth it for a DD.
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Last edited by bear-avhistory; 01-28-2013 at 10:17 AM.
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