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I guess its just the exhaust manifolds...I had a ZC header and port-matched my old A6 head to it...it's nice, easy little upgrade.
I personally stayed away from the ZC's manily becasue they don't have alot of options for them. There little to no aftermarket for the valve train or cams. I've built a couple A6's a put 130+hp at the wheels of them with a little machine work, a decent street cam, and basic bolt on's.
Hmm i have a D16A6 manifold....so you saing that it workes fine? But arent the intake tubes smaller then the heads?
Im planing on swaping all the parts from A6 (EACV and fast idle valv) to my ZC1 A1 intake.
Just caz all my wires are for a SI
Damn have to take a look at the A6 intake.....was i hard to port-match it?