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Unfortunately, by doing this, the A/F ratio is thrown off by the extra "fresh air" in the exhaust stream. By removing the air injection system you can achieve an accurate A/F ratio.This addition will typically remove the majority of popping on deceleration that can be experienced with unburned gasses within the emission charcoal chamber. Note: Proper tuning may be needed and this is general feedback.Fits:YAMAHAFJ-09 15-17, FZ-09 14-17, MT-09 18-19, MT-09GT 19, XSR900 16-19, YXZ1000R 16-18, YXZ1000RSS 17-18