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if your running dsm injectors you have to have a resistor box. depends, I seen some ls running 8lbs put down about 250whp. i think it was like 248 or something like that. but that was 100% stock everything.
yes if your running dsm injectors you need to use a resistor box. i had a stock ls on 12psi putting down 261 whp. ive seen stock ls motors with massive injectors,race gas and tuning put down over 300 whp, but that was a straight race car. ls motor with a thicker headgasket, good turbo system,proper tuning, and fuel system should easily put down 250+whp.