I can breath through it -need advice.

MartianBob

Registered User
The bypass butterfly on my brand new after market intake plenum is .018 undersized. When fully closed I can breathe through it without much effort.
Are they all this far off? My stock inlet bypass seals almost completely when shut.
Seems like this will lower boost noticeably.
I'm considering having a shop fab up a larger butterfly plate but not too excited about putting more money into this part.
Did you look at yours before bolting it on? How well did it seal?
Thanks
Bob
 
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