I'm working on cleaning up the new(to me) motor and trans that's sitting in auxilary's garage right now. It's the MSA system, complete from header to tailpipes. N42 block and head, N36 manifolds, stock SUs(I'd have to research which year they're from, but they've got the knurled barrel nut on the mixture adjustment instead of the flat notched wheel). I'm looking forward to Ferrari noises.
Aux and I have kicked around fabbing out the crossover and putting in two straight pipes. Not sure what this will do to the sound(more like an exotic V-12? Less?), but as Tony said, I'll probably not even notice the difference in power, assuming there is one. I'm actually looking for mileage at this point, considering my Z is daily driven.
What a great sound! I hope I don't piss off everyone in my apartment complex when they finally go on.
Looks as if there might be a clearance issue underneath...they really hang down low, don't they?