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the j35a4 is a good engine you can run 5lbs with 91 or better pump gas and stock computer and should be around 400hp i ran mine at 8lbs with 110 race gas just to be safe should have been in the neighborhood of 450 ish hp that was also with a stock comp never had 1 problem with it in 2 years with a 4e hooked to it1 point