My car have 249 rwhp and 312rwtq. My upper is slightly ported ( i've only ported what was accessible with my die grinder). This spring, i will add longtube with x-pipe and maybe an extruded hone upper. I hope that those mods will gave me 10rwhp. My heads have the stock valves with hi lift spring. My car is speed density so maybe 5-7 rwhp less with mass-air (maybe more, but not sure)
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Ported stock heads and intake, 65mm throttle body, 1.7 roller rockers, pulley, superchip,afpr, electric fan, motorsport headers, magnaflow cat-back, hurst shifter, 3.55 gear, speed density computer
12.81@ 104.7 on E.T street (1.77)
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