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Im not a GSR owner my-self, but my best friend has a stock GSR except he put on an Injen CAI a few days ago, or i put it on for him lol. Ne way you should be running far faster, then high 15's his best run when his car was completely stock was a 14.9. If you could post the stats of your time slip like your 60ft, 1/8 mile, and reatction time we could see where you could improve on. It could also be where you ran your car at wheather has a lot to to with how cars run, luckly for where we run our cars, the track's elevation is 0 meaning it is at sea level so the cars here run faster then the cars at higher altitudes, because the higher you go the thiner the air gets making it harder for the car to breath. I my self have ran a 16.4 in my DX at that track. Ne way post your slip, and keep practicing.