ive owned 2 of them the one i have now has the dynotech box and i did the exhaust mod and it runs much better than a slip on i had the hmf at over 400 and the exhaust mod works the best same mod as prairie 650 check your jetting sounds as loud as a grizzly

 

Pro Curcuit will be my choice

 

I JUST LOOKED AT BF BOBS PICS! PARTY AT BOBS PLACE!!!!!!!!!!!! WOOOOHOOOOO! GRAB THE COOLER AND TIE -DOWNS SOMEBODY