I would like to get a slip-on exhaust. But I would like to know which is the best for the grizzly 660? I want something with deep sound and has a great increase on power throughout.

Mabe White Brothers E-Series, HMF, or DR.D?

Please let me know what y'all think. Thanks

 

Your not going to get a "great" increase with any slip-on. A full system will provide much more performance. I would also look into the GYTR system or silencer as they are designed by Yami, for Yami. I'm not saying it's the best because I've done no research, but I wouldn't negate it.