after market utility exhaust ?

[CK1999_400ex]

i was just wondering if any one would like to share how much it changed the preformance on there utility ? i have a 2006 polaris sportsman 500 X2 with efi and was thinking about the hmf pipe ... any one have this pipe ?and on a polaris with efi ?

[swampcat07]

It did alot for preformance but if I were to do it again I would skip the exhaust, too noisy. I have a black Magic but HMF is a bit louder than that I think.

You will not see crazy gains unless you replace the header also.

[Ajmboy]

I'm very happy with my HMF pipe on my Grizzly. More responsive, but ofcourse I jetted it also. I wrote a review about it a while back, looks like they opened it up for commenting now:confused:: ATV Articles » HMF Swamp Series Slip On Exhaust Review » QUADCRAZY ATV Community