I have a new C6 & 2045 combo mounted on my lightweight LS2P, but i dont find it that powerful. But my XZ mounted on my old & heavy LSP-R really is brutally powerful. The C6 comes stock with 7mm restrictor, so maybe that explains why its so weak. The stock XZ comes with 9mm restrictor and the power was SO untamable the rpm wouldnt spool down fast enuf which made it difficult to drive, esp when jumping. I finally tamed it down by putting in a 8mm restrictor and adding 1 head shim. Which is more fun to drive? The XZ anytime. But for race, I would use the C6 for its fuel efficiency.