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      06-05-2009, 02:03 PM   #27
USCRooЯ
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Drives: 335i
Join Date: Feb 2009
Location: SoCal.

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Quote:
Originally Posted by Zeph View Post
I won't buy them just because they call them 3" DP's. Not big on liars. More importantly, I don't see how going from 2.5 - 3 - 2.5 can increase flow or decrease back-pressure. Actually to me it only seems worse to expand and compress the air again. They should just be 2.5" all the way for the best possible flow.

If this were N/A car then the 3" center pocket can be useful for exhaust scavenging, but this is a turbo application which makes that not applicable.
huh?

it goes from 3inch to 2.75 to 2.5 instead of other DPs that go from 3 directly to 2.5.

thats the difference in design, i assume the longer transition and gradual decrease instead of an abrupt one is the difference.
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