On the cheap (best kind of mod), I swapped out my LG4's exhaust for the L69: manifolds, EFE valve, y-pipe, and intermediate pipe. The difference in pipes, especially the y-pipe, is nothing short of huge--shoot, the L69 stock intermediate pipe was larger than my aftermarket! Best mod possible? Probably not. Am I smiling? Yep.

Motor mounts also have me smiling. One of the stock rubber one's was shot, allowing the motor to flop around a bit. I replaced with ES poly. Very smooth in comparsion.

JamesC