They all claim 10 - 15 hp. It'll help but not enough to pull 7,000lbs up hill. Good luck keep us informed as to the results. I recently ordered but have not installed a supercharger, for the same reason, 7,000lb trailer. However the only hills around here are overpasses. but still struggling to stay above 60mph and stay in 3rd gear. It wants to run in 2nd above 70 mph.
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