shooting for 400!
oh and those bigger cams like that, you won't want to mill for PTV reasons.
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Just get the port work done (make sure they are credible) and don't take any material off the deck. You will need it for the clearance. PTV is already really close with T-rex and stock heads.
I would go with either EFI Live or HP Tuners honestly.
Yeah a 9 might be a better choice anyway, but most of the tme you hear of people with M6 going the 9' route and A4 going the 12 bolt. That 9' can take a regular beat-down...don't worry about breaking it. 8.8 isnt a bad idea either. I say go with the cheapest one of those 2 that you can find.

