swap. Parasitic loss from a s/c is going to eat up at least 10% of the power at the crank. My dd has a s/c and it is an animal, but mb just tt'd the same displacement motor, and it is an absolute beast, here is a 55k motor (on a smaller crossfire chasis) and a handful of mods vs. the brand new tt motor (in a huge 4 door sedan) and about the same amount of mods.