hib ' I didn't mean totally stk . as an old ahra drag racer headers was stk sorry. my car has ported inj housings jeal headers dyno tech hi-flowcats ccomplete flowmasters 21/2 in exhaust. and a custom prom . the best thing is no knock event at 5200. Corey henderson did the porting and the tune as well as installed 410 gears. his ph 210-867-6286. he would have the answers on nthe sae figure. i remember reading your modsto the flow master and really wanted to hit 420 rwhp a personal goal. i really just wanted to share what a fine job that young man did. i have been in hotrodding 35yrs and as we all know it can be hard to find a relly good shop that does what they say and giving a good monitary a plus. I wasn't bragging and sorry if any one felt that way, notmy intention at all. Corey is just getting ready to open up a real business instead of his back yard and thought to share my experience to give the zr1 guys another choice if they so desired. I wanted to pick your brain about that xpipe in a muf to see what your thoughts were. this old guy would like to be a little on the sleeper side .loud is for young folk Imho. if you have suggestion on how to improve my ex tract i would be very thankfull. Maybe i can get corey to post the dyno sheets . alli have is a lapp top. sorry