If you want the best power gains use HMF
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Put the HMF Pipe on my 2000 Big Bear 400 along with a bigger main Jet in the carburetor and talk about waking it up! Its a totally different machine now.
Slip on exhaust hmf isway better than the factory exhaust because hmf is. Proformnce exhaust which means sounds better
Exhaust is really loud!! Especially when it gets wet. But to fix that just repack the muffler..... I love the exhaust nice deep sound and way better throttle response.
Great power, big noise.
great exhaust very easy install only complaint is that the pipe makes your bike stupid loud.