i toke ur advice and did a compression test and it came out 183 across which it means is a stock ls and the only reason y i pull more is cuz i just got 4-1 dc sport headers . my car is an ls with headers intake and a 65 shot i plan to get it tune on a 80 shot soon but im kinda low on money now into i get paid and then im goin to put it on the dyno but when i got my more and put in i was impress cuz is strong as hell