I free flowing exhaust and intake is about all I know of, I think there might be a chip out of Austraila but not sure how well they work.

Dennis


95 Sportage, gone but not forgotten.
98 Jeep TJ, 4" Zone springs with RC Long arms, Ford 8.8", 4.56 gears & Detroit locker rear, D30, 4.56 & Detroit Trutrack front.