6mm ... good for up to 400 horsepower and maybe some more. I didn't exactly need this upgrade, I just needed a fuel rail for the new intake (it's not the same as q4, neither as integrale's) and decided to go bigger just in case.
Yeah, I admit it, I was a little bored from all this lag
No, I don't ... I just put the two VIS cams, and tuned them on the dyno. They are not the best cams for turbo, but as long as I have them for free (they were in the used head I bought for this car) they are good for me
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