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Lightweight flywheel

Transmission

Vehicle Information: Year: 2002; Engine (Size, Modifications): 3.6 TT X50 ; Total Mileage: 20K;

I recently installed a GT3 RS flywheel on my 2002 996 TT X50 (bought from Suncoast Porsche):http://e-partssales.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=P&.... The car runs great, but I can notice a slight vibration in the tranny while in idle. No issues with shifting (it's also got a B&M short shifter kit, recntly installed, 100 miles ago), the clutch was replaced at the same time. Any ideas? Should I be concerned? I'd hate to have to go back to the stock flywheel (the difference in weight is DRAMATIC).A friend suggested I should use a double mass flywheel. What's the difference? The GT3 unit is a single unit.The car is used mostly for HPDE events, but I also drive it at least 2-3 times/week. Thanks for your help.

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