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for an FR its normally 15% drive train loss, 25% is normal for 4WD.
that chart shows intake, pulley, header, exhaust, cams, and, tuning still only made 163. port matching wont get u 20 whp, these motors just dont make much power, its to big for its own good it cant rev. s13s go faster short shifting at 6k as apposed to its 7k redline with stock cams
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