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The heads/valves are the limiting factor they will only flow so much gas, but close to 85-90 should be achievable. I would think around a 5-10% increase with a full exhaust and fueling mods. Its torque you really want to increase, thats more usuable power than outright max hp
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 Roast Beef Monster!
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S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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