i dont think it is neccessary to tune the car yet if you have plans to go with headers. I have berk hfc, greddy tic and k&n intake. Still have good gains on a mustang dyno at RG. And i think nitrouz mentioned that after his test pipe exhaust and stillen g3, uprev didnt help much on his car. i could be wrong, i remember reading it on his post awhile back
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