::sigh::
VTEC, N1...
if you want to shell out the mucho moolah to do an LS/VTEC conversion, go for it, but make sure the person doing it (hopefully not you) knows EXACTLY what they are doing. I'd just go the GSR motor swap route.
Any exhaust that is 3" ID throughout (no bottlenecks) will be perfect for that turbo. It's really just a matter of preference.