I have. 95mm CAI, GT-500 throttlebody, FRPP CMRC delete plates, Underdrive pulleys, BULLITT mufflers. with an email tune I ran 13.05 @ 107.44 mph on factory BFG 18's WITH the factory 3.31 rear gears. Thursday I have a meeting with the guys from American Racing headers about becoming a dealer and if all goes well I'll install a set on my car. I estimate those longtubes and a dyno tune I'll run 12.8 on street tires and dead 3.31 rear gears.