yea because im getting supertrapp 3 inch disk race series pipe this month. and they told its very good and sounds better. and performs better than the white bros. supposebly.

 

White Brothers E-Series full system or the R-4 full system. They don't make the R-4 anymore but look on ebay. There was a full system for $315, and that is pretty damn inexpensive. The LRD full system is great also for $430.

 

i have a pro circut t-4 i bought it that way i don;t really know how much of a power gain it got but all i know is i 12 o'clocked her in the dirt and i broke the bracket just something you might want to take inot consideration

 

Go to the website for atvoutfitters and check out their performance kit. It comes with the HMF pipe and mine is louder than the stock even with the silent core installed, but its a good deeper rumble sound. I went to the website for the performance kit and typed in my type of atv. There it shows you the approximate hp gains to expect and a dyno chart of the same type atv before and after. Maybe this will help. I sure have a lot more tork on my Foreman after the installation. Hope this helps..oh yea, and the price was just a little over 300 for the whole kit.

 

I went with the Sparks X-6,good power increase,not terribly loud either.