going from a 2.5 to 3" dp
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03-18-2013, 07:55 PM
15 WRX 6MT CWP
Won't matter a bit. 3" catted DP is a 3" catted DP. The breathing room is needed up near the turbo, hence the "bellmouth." The invidia DP is also "bellmouth" it just has a divorced wastegate section that plumbs back into the pipe downstream.
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