I ran one on a Yamaha Rhino for 6,000+ miles, I’m running one on my P7-4, and my 520 Foreman Rubicon. I’ve never noticed any power being robbed, just noise being robbed. Also never noticed any abnormal smell after the paint is burnt off. With that being said I also do not ride at high elevations.Put one of those on my 500 for about 45 mins. It was quieter but robbed power and stunk to high heaven, probably due to creating back pressure. Went back to the trail head and took that thing off. Sent it back and got a full refund. I'd only recommend it if you're a hunter and noise level is critical, for trail riding it sucked.
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