we did a light rebuild on the motor - new rings,bearings, gaskets, surfaced block & head, honed bvores etc. i also did a little porting as well.
exhaust system was made up out of a set of black-top 20v extractors (modified) a high-flow 2.5" cat, and a truck muffler. ran really well. (we also fitted a 6 sbeed box to the car at the same time - made it a ball to drive!!)