Sports exhaust on an Auto BMW?

Johnny G

I was wondering if it is worth it to put a Sports Exhaust on a BMW with Automatic transmission. Will it:
a) Still improve my cars performance, and
b) Will it sound good (i have heard that sports exhausts sound like rubbish on an auto)

Answer
the performance of an exhaust system is not dictated by the transmission. the sound and performance of an exhaust is related to the engine, regardless of transmission.

some people confuse this, because auto transmissions are typically programmed to shift at relatively low RPMs during normal driving. in this case, you typically won't get the full benefit of the exhaust system. however, if you hold the accelerator down, even the auto transmissions will rev higher and give you the better sound and better utilize the increased exhaust flow capacity.

bottom line, the exhaust system's performance is related to the engine, not the transmission. but different transmission types may require you to drive differently to get the engine revs up in order to gain the full benefit of a performance exhaust system.

Questions about Exhaust Systems..?

Damo

I've had a 2inch Sports Exhaust System put in my car about 4 - 5months ago and when my car is cold it seems to make a crackling noise.. as 1st i thought because it was new and had to wear in but it still makes it, is this all meant to be normal?

Also there are days where it will sound nice and a deep sound, an then there is other days where i can hardly hear it..

I was told as well that you can get twin exhaust systems put in, my brother had told me about this.. Are you able to do this on any car?

Answer
If we knew the year make and model of your car possibly someone bakes a true dual exhaust system. The noise you're hearing is common when you shut the motor off and the exhaust system is cooling down. It's an expansion and contraction thing going on inside the exhaust pipes and what ever type of muffler you have.

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