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Just put a 79mm and 90mm idler and making 10.5 across the board. Only other mods that would affect back pressure are Ford Racing res. delete and Borla axle back. What HP are you seeing with that or the 80mm? Having a local tuner tune it and numbers seem a little low.

Dropped off today for opg and sprocket along with 79mm pulley injectors and bap. Made 499 in 5th before hitting the speed limiter and 476 in 4th. Will post after numbers when done.

Just purchased a 2015 GT that had the roush phase 1 added at the dealership. Car only had 1100 miles on it. The original owner told me the Roush warranty was transferable as that's what the dealership told him. After reading about 20 different threads on here I quickly learned that its not. Long...