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Subject My TT was very raspy until I swapped out some exhaust
     
Posted by lil'abner on March 25, 2006 at 4:37 AM
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In Reply To I had HKS resonated H-pipe with Greddy SP, then posted by DMoneyTT on March 24, 2006 at 10:10 PM
     
Message pieces. I have gotten under my car in a pit with a mechanics stethescope and tried to sort this out the best I could.

I presently have Dupree split DP's, Jet Hot coated; Dupree mid-pipes with high flow cats; and JWT/Genie cat back with resonated H-pipe and oval tips. The car sounds great. There is still a hint of raspiness that is coming from, IMHO, the H- pipe itself. On deceleration there is a raspy scavenge flow across the H connection. This makes sense because the direction of the exhaust flow is at a right angle to the cross piece. This is one reason why I believe X-pipes are superior to H-pipes. With X-pipes, the natural direction of the flow of the exhaust is what equalizes the pressures between the two sides, and not a "bridge" piece of pipe stuck on at a right angle. I will be switching to a resonated X-pipe, MS manifolds if and when they come to market, and super-split DP's, soon.

     
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