Quote:
Originally Posted by Franco
Cool. Thanks for the idea. What does the vacuum hose normally do? and are there any disadvantages of disconnecting it?
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babybmw.net may have a more concise explanation but from what I rememeber:
The vacum operates a flap in the exhaust, normally the flap is open from idle until about 1600 rpm, then it closes and opens again at around 4500 rpm (not sure of exact revs).
So disconecting it gives you a deeper bassy sound in the midrange and bit of "burble" on the overrun.:biggrin:
It is easy to find, stick your head under the rear bumper where exhaust pipes connect to the rear muffler and you will find a black hose, simply pull it off and plug it with a screw - job done (takes 2 minutes and you can easily reverse it).
I haven't noticed any negative effects.