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After installing only a Factory Pipe Limited Exhaust system with the recommended jetting speed and rpm improved from 44.6 mph @ 6,200 rpm to 48.3 mph @ 6,700 rpm. A gain of 500rpm and 3.7mph just by changing only the exhaust system! Designed for stock to mildly modified Superjets. System comes complete with FPP's exclusive tunable head pipe, aluminum chamber, tuned exhaust manifold and all required hardware