I had a GSR that ran a 13.7 with a stock motor and a 80 shot NOS. If the GSR you are racing is turbo'd with built internals, you are going to lose. A friend of mine has a GSR with a Drag II turbo kit running 12psi and runs 12.70 ALL DAY at the track. He has a STOCK motor, no internals. PLus I used to build Honda motors (like my own) beforeI got a Z. Just be carefull, if its built and tuned right, it has the capability to run low 12's with a good driver.