[Jfrahm]

I understand how the variocam adjusts the intake cam timing, I thought you were implying that there was a phasing adjustment as well. 968 Variocam just moves between two fixed points so if you want to advance or retard the exhaust cam without taking the intake cam along for the ride you have to go beyond the stock setup.

When you say "you adjust one cam to the other with that" you imply there is a relative adjustment between the cams when they are actually fixed relative to one another. You adjust the intake cam relative to the crank with the slotted sprocket.

With custom cams there could be some left on the table due to a lack of ability to degree in the exhaust cam, but the intake is likely more sensitive so the first goal would be to dial in the intake cam and then testing advance and retard of the whole system. Personally I would mark up the stock sprocket and see if you can be happy within the limits of that adjustment. The lack of available adjustable sprockets is somewhat telling.