Good information here, thanks guys. Paying close attention as I'm heading down this path eventually myself. I can only afford performance upgrades in phases, engine is stock, well-maintained and running great, with 98k kilometers on the odometer. I resolved brake & cooling issues last summer, upgraded to an aluminum F-body rad and replaced accumulator ball. Those issues seem to have been resolved now. This summer I've planned modest upgrades, I'll be fabbing my own intake with 3.5" pipe to the turbo, LS1 MAF, 9 x 4" K & N and have to choose a MAF translator for that combo. I plan to block off the EGR port and add a manual boost controller. Next summer I'll be taking into consideration the advice here.