Hello, have a 20 km/h lower final speed at my AAM, since I have a fan manifold and a machined preheater, a 20 km/h lower final speed! Is that normal? He has a much better pull at the lower speed range, but does it really hard at the 5th, although he turns out properly. What can I do to lift the Vmax again? Does this help a camshaft (Dbilas, Schrick, etc.)? What else helps (jetz besides other motor/gear)! MfG Basti