280rwhp is way high. More like 280 flywheel. Your car is lighter than a new GT by a good 200-300lbs, you should have whooped it even with equal hp.
Your injectors are too big, and your intake is too small. Everybody runs outta money, but right now I wouldn't expect your combo to get anywhere near 300hp+. The intake will not support it, and the injectors you have are so far overkill it's not even funny. With the spray pattern they have, I'm kinda suprised it even runs.
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