at age 15 for your first motor you proally done allright . if its going in that pretty lil 55 id say enjoy what you have built and when its tired or it breaks then build for your 500 hp. you have to remember with horsepower comes responsiabiity . run what you have now you will be happy next time around if you think you want more power and bad gas mileage then build for it.
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if you cant smoke the tires at 60 mph your engine needs work ! 
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