I run a Turbonetics T3 on a SIRII B16A at 15psi on 93 octane and I can rape most f bodies and stangs all day long. But you will likely only be beating lightly modded f bodies running 13's (which is what you would be running at 12-15psi with decent traction). I know guys with Trans Am's and Z28's running mid 12's with only a couple grand in mods. I am built (crower rods, cams, SRP Slugs, APR hardware, etc) and could easily push the limit up to 20 psi but im not as brave as I used to be so I stay pretty mild with my coupe since I need it to last a while in order to finish other projects I have. I have a custom kit but I did have the greddy SI kit for a while on my first B16A and it was not to my liking power wise. It was a nicely put together kit if you are a novice though. I would look for a kit that can be upgraded. A decent custom kit with intercooler will run you about $3,500.00.