Quote:
Originally Posted by Mr Breeze
Pull the short rubber vacuum hose between the valve and the flap actuator. (it is "S" shaped under the rear bumper) Cover each end nipple with carb vacuum caps (you can find on amazon or ebay - search on "Holley vacuum line caps". This will give you more rumble and it's easy to put back if you are worried about BMW service folks.
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That has the side effect of causing rough idle with a cold engine.