Thread: cold start
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      12-03-2011, 12:36 AM   #24
Mike Benvo
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Drives: Harrop SC M3 / E46 M3 / 7Turbo
Join Date: Apr 2008
Location: SoCal

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2008 BMW M3  [5.00]
1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
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Originally Posted by THE TECH View Post
I'm leaving it in on mine. Love that sound!

I had it off for awhile.. Definitely makes the cold starts much more smooth..

The pump is there simply to warm the cats for emissions reasons, because the precious metals inside do not catalyze the exhaust gases (reducing emissions) until the cats reach operating temperature.

I guess leaving it on makes up for my de-catted turbo 7 series

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