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Porschephd Porschephd is offline
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Join Date: Aug 2002
Location: OverlandPark KS (Kansas City)
Posts: 530
You have to close it, but be aware you more than likely will loose a box. The last one I built I actually made a box out of sheet metal. Unless you can install some type of pressure valve that is above your boost levels but below the backfire pressure you are going to have issues. I was never successful in fully eliminating the issue and built a box that wouldn't split.
94 3.6Turbo 6-speed AWD
Old 06-09-2011, 07:27 AM
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