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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 09-27-2005, 04:30 PM   #1 (permalink)
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Stock exhaust mods

I remember seeing something on the site about taking that vacuum hose of the exhaust used: . I decided to take mine off to see what it will do or if I even notice anything. Does anyone know the pros and cons of this?
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Old 09-27-2005, 10:22 PM   #2 (permalink)
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less lower RPM torque, no increase at higher RPMs.
if you wanna feel a speed gain, then REMOVE the little flap.
You won't notice a difference, (there almost wont be) but thats the best you can do to the stock exhaust without drilling holes and crap.
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Old 09-28-2005, 03:58 AM   #3 (permalink)
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how would u get a speed gain if u are losing torque and not gaining any by removing the flap. i would think just takin off that vacuum hose is like removing the flap
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Old 09-28-2005, 06:34 AM   #4 (permalink)
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With the hose connected, the flap is closed below 2500rpm, open above 2500rpm. Taking it off will leave the flap open at all times, whether you plug the hose up or not. Since your powerband is well above 2500rpm, it really makes absolutely no difference, no matter what you do. Removing the flap doesn't do anything, since it has no flow resistance when open. Nothing to be gained there, IMO.
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Old 09-28-2005, 06:45 PM   #5 (permalink)
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well, it BEING there creates flow resistance, but it's negligible.
Our E36's arn't very restricted to begin with
I'd leave it alone.
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