Great sounding pipe!! Take the spark arrestor out of the end and it sounds even better! I noticed a little power gain but over all just sounds great at low and high rpms!!
HMF Penland Pro Slip-On Exhaust
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Bought this for my 450 foreman and OH MY GOD, the power increase was sweet, and Sound is just amazing. Even though i am going to use this to hunt i found if you cut a can of coke in half, use the end that you drink out of, buy a hose clamp and put it on the end cap it sounds about like stock. But it bolted right up without any trouble and im no rocket scientist, be sure to jet your fourwheeler when you buy this though, because it will make you see a huge power gain and your motor runs alot better.
2004 Yamaha Grizzly 660 - Bolts up well, didn't notice much of a power increase over what I had, but I was changing from another aftermarket exhuast. Overall, not bad, but very loud. My buddies didn't even want to ride near me. I have since ordered the quiet core and will try that out to see if it will soften up a bit.
If you don't care about the sound, it's a great deal on closeout.