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  1. Engine / Airbox / Exhaust / Fuel Delivery
    Hey guys. I installed a full Yosh. carbon fiber exhaust a couple months ago and was going to wait until I got a PC3 before I installed the K&N filter. But I had the airbox off yesterday so in went the K&N filter. The exhaust is the one seen here The main question is am I running too lean. I...
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