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Just adding to the above posts. If you are lucky enough to have exclusive e85 access then you can just pony up for an e85 tune when you purchase your turbo kit, otherwise you may want to consider a flex kit or at the very least dual maps with mapswitching (Ecutek). Depending on the kit you choose, you may also want to consider the cost of supporting mods (gauges, boost controller, front pipe/over pipe, etc). On cat choice, my suggestion would be only one hi flow in the entire system. Whether it is in the header or the front pipe may not matter (others can advise) , but i do know first hand that a hi flow header cat combined with the stock front pipe cat and over pipe is enough to lose 1-2 lbs of boost on a 7 psi spring and your going to need more boost than that to hit your goals. I am pretty close to 300whp on e-85 with about 5 psi. Good luck!
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