Installed this on my 2013 CRF450R as I wanted to keep the dual exhaust because it looks incredible and sounds even better. Louder than stock without the spark arrestors and that is exactly what I wanted. I removed the air filter screen and then had the local shop remap the ECU . It feels like a big increase in power but some of that may be just the great sounding motor.
FMF Factory 4.1 RCT Complete Exhaust With Stainless Megabomb Header - Dual
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This exhaust was the missing link on my 2013 CRF 450R. It made it more snappier and helped the bike pull better instead of flattening out. When I rode with it for the first time I knew immediatley my bike responded better.
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