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HMF Competition Series Exhaust and Fuel Optimizer Review

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When it comes to adding more power to your ATV, the first thing that usually comes to mind is bolting on a slip-on exhaust. However, that usually means you are also bolting on a lot more noise. HMF do...

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I'd really.like to get a new system for the Z400. Right now I just have a White Bros. E Series slip on and stage 1 jet kit and a K&N. If I was to do a full HMF exhaust system would I have to re-jet?

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