Last summer I did some testing in our local track with Proxes R888 semi slicks.
Suspension was then with 996 Cup springs and therefore quite cool to drive as a street car.
Engine is appr 60k km driven Porsche Ag aftermarket engine with some upgrades:
Some help for typical 3.4L engine oil starvation in long G force corners (which probably causes major amount of problems with 3.4L M96 engines,
-cup exhaust headers, race catalysators
-cup X51 oil pan with baffle oil walls
-X51 double oil pump in passenger side with extra oil exit line out from passenger side valve cover
Without these modifications, as if oil pump starves of oil > piston rod bearing failures, > some affect to IMS and RMS failures etc... These alterations should be done to every M96 non Metzger engine... So this doesn't have problems in race track, at least hasn't yet.
You can read more of that from here:
TTP Automotive GmbH Turbo Technik Pietz
It also has enlarged throttle body with double filter intake and something else too:
