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Just got back from a 40mile test ride. Through pipe and those resistance plugs. Bike had a roughly idle. The bike was cool when starting and I had the tank off. So could be why. Since its been warm ive started three times. Everything is perfect as far as I can tell. I’ll post again in a week or so or after a few more hundred miles. Learned that the cat pipe is an H pipe. And the new through pipe is not.