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      11-15-2012, 03:12 PM   #127
jippii ensio
Drives: 335i
Join Date: Feb 2009
Location: On the road

Posts: 1,200
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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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