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The Yamaha Raptor 660 is available as a Slip-On or Full System in the Performance and Competition exhausts. Depending on the exhaust series, the slip-on system picks up 10-15% more horse power, while the Full System adds 15-25% more. There will be a 4-6dB increase in sound when compared to the stock muffler, however the Competition Inserts and HMF Quiet Core can decrease those 2-4 dB.
Fits: (01-05) Raptor 660R, T, SET, YFM660RN
FUEL TUNING IS REQUIREDLEARN MORE
Fuel Tuning is absolutely required when installing an HMF Exhaust on this machine. Failure to tune the engine can cause excessive damage to the exhaust system and engine, while voiding the warranty on your exhaust and possibly on your machine. (check with local dealer). See the tuning settings below for the proper fuel tuning solution on your machine.
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