I am going to purchase either a full system or a slip-on for my 2007 grizzly 700. Does anyone have any suggestions. I have searched all kinds. I am getting a feeling that the hmf is a good one. I was also looking into 2 brothers. What is a dobeck. I was asked if I wanted a dobeck while I was going to order the hmf from worldwideperformance1.com. Also, what series?