[dirty4man]

yes a aftermarket exhaust and filter will improve your performance. Jetting will be required with any aftermarket exhaust. I have never used the HMF, so I can't help you there. But from reading the Ultra Quiet QS1 Eco-System might be what your looking for. As long as you don't hammer the throttle it want be to bad. I use the Uni filter and it is a big upgrade over stock. Also it is half the price of a K&N. Both are great filters, but for me I think the UNI is easier to maintain then the K&N.

 

[dirty4man]

I think it is called an Aaen's Megahorn, Megaphone or something like that. It came off a 500 Polaris that a friend got rid of. The price was right (free) so I just cut the end off and welded it to my exhaust pipe. At low speeds it not to bad, but once you rump on it, it gets loud.

 

[dirty4man]

yes fuel mileage will drop, I burn a tank of fuel compared to my wifes stock foreman using about 1/2. I do alot more playing then she does also. It also depends on the style of riding you do. I run mine pretty hard.