assuming the block is built id be running more than 12 psi,more like 20, definite low 12's on slicks, just ask buttfed terry,he went 11's on a b16 block w/internals and lots of boost, and if your looking for power, your gonna want to build the b16 block and bost the shit out of it and forget about the stock gsr block in terms of turbocharged hp and most likely a faster 1/4 mile time.......