PTF UPDATE: 553WHP 631WTQ - N54 TwinTurbo World Record
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11-15-2012, 04:12 PM
Join Date: Feb 2009
Location: On the road
They upgraded exhaust valves, but porting the head without upgrading valves flows almost the same and doing it at the same time with upgrading turbos saves a lot of hours. Porting shouldn't take too long.
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