BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > more "exotic sounding exhaust"?

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      10-08-2008, 04:57 PM   #23
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autobahn exotics is my favorite by far:

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      10-08-2008, 09:02 PM   #24
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Yes, we know.. It sounds awesome.
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      10-08-2008, 09:11 PM   #25
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Mathematically, if you would like to achieve a higher pitched and "screaming" exhaust like the more exotic cars out there, you need to change the piping flow dynamic.

If you drop (reduce) the diameter of the 2 exhaust pipes, you are inherently changing the behavior of the pressure wave inside the exhaust piping. When you downsize the piping, you are creating a higher frequency pressure wave and this will increase the pitch of the exhaust note drastically. The larger you make the exhaust piping, the lower and more rumbly the tone. (This would be due to a lower frequency wave) The smaller the diameters, the higher the pitch.

Now I know many would be concerned with exhaust flow. There is a solution. Keep the 2.5 inch pipes coming from the downpipes back, and toward the end, split each pipe into TWO 2" pipes on each side. This will give you a quad from the axle back to the rear bumper. There are plenty of muffler company's, including Magnaflow that have mufflers with dual 2 inch inlets and outlets. (Vibrant, Magnaflow, etc..)

I Hope this helps a little.

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      10-08-2008, 09:17 PM   #26
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      10-08-2008, 09:22 PM   #27
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Autobhan Exotics....... Only thing stopping me from getting one is the fact that they dont have the quad version out yet.
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      10-09-2008, 01:38 AM   #28
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      10-09-2008, 02:13 AM   #29
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dont do straight pipes....its soooo loud..i had dual 3 inch str8 pipes.it took me 3 days b4 i got stoped...and when i did the cop said she heard me 10 blocks away lol.....do 2 .3inch pipes with a resignator on it...mine sounds sick!!!!
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