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  1. Gen 4: 2011-2015 Cat removal with K&N airfilter

    Performance and Tech
    Hello everyone, I recently bought a 2011 Gen 4 and I am stoked to remove the cat underneath this bike. I currently have a leovince SBK titanium slip on and just bought a Laser midpipe. My question would be, how harmfull could would it be to replace the cat with the midpipe without finetuning...