Honestly there both bottom of the line up on #'s. The DG is a loud pipe. The HMF's are loud to. I wouldn't waste money on either, I would recommend on going sparks, ct, rossier, ron woods/etc. I would steer away from the cheaper pipes and keep in mind you get what you pay for. I had a dg before and still have one on my yfz. I will say after the one on my 400ex the dg cobra. It was a piece of junk. It kept breaking the bottom baffle retainer bolt off and it sent my baffle flying threw the air more than 4 occasions and was just too cheap. I would check to see if monster makes a single for that to. Paul at monsterquad makes some bad azz stuff. Check with the site sponsors they will hook you up with something good.