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Re: "Performance" Exhausts... A Must Read... (archive)
[ Follow Ups ] [ 6-series (E24) Message Board ] [ Msg. Board FAQ ]
Posted by Keith on August 14, 2000 at 05:19:57:

In Reply to: "Performance" Exhausts... A Must Read... posted by Joe ///M on August 13, 2000 at 21:10:27:


According to SEVERAL people I have spoken to, including a man who built F1 motors in France, a free flow exhaust will HARM the performance of an e24, and could actually hurt the motor as well. The 3.5l motor was designed FOR backpressure, and a FREEFLOW system is NOT worth the money. The Euro M6 and US M6 should only be used WITH FACTORY MOTORSPORT EXHAUSTS!!! The Us 635csi is a bit more marginal, but you should STILL steer clear of the Free Flow!!!

Food for thought.

BTW, we dynoed my M635csi w/ w/out the free flow B&B, and I LOST 4HP from 2500-4500 RPM, and I lost over 10 horses at 5000!!! The torque only suffered a bit, 4-6 foot lbs. throughout the entire powerband. Needless to say, I sent my exhaust back to Billy... The "quieted" version of the B&B actually HAS backpressure, and is almost to BMW spec...

Joe ///M


Joe ///M

Any well designed free flow exhaust system has back pressure. That is the beautiful deep gurgle you hear letting off the gas. I don,t think one can say scrap the options and only go with stock


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