[Herr-Kuhn]

I actually have a set of 84 heads that are o-ringed. I'm not a big fan of specialized head gaskets...like copper or laminar aftermarket units. I'm of the opinion that a gasket will tank because of detonation. Certainly o-ringing the heads locks the gasket into place so it can withstand the abuse of some detonation without checking out. I've seen too many poeple use copper units or laminar units and end up with coolant leaks. Honestly I have never blown a head gasket on a turbocharged 928 and that is on all 4 cars I've built. A stock gasket is a pretty good joint assuming the surfaces are flat and it is torqued down.

One way to open things up would be with a new intake manifold...look at the stock power curve and you can see what I mean. Something with minimal bends but still having decent runner length to make the midrange torque required by a turbo junkie.