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  1. YFZR-X Powertrain
    2017 450r HMF performance slip on exhaust HMF fuel optimizer Pro design - Pro Flow K&N intake w/o a top cover I'm noticing slight hesitation at lower rpms when rolling into throttle/light acceleration. As well as an excessive amount of backfire around those same rpms or with light blips. Mid/top...
    help hmf intake optimizer tuning
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