I have a 2011 DS450X MX with an HMF slip on and a K&N intake with a high-flow lid and an Attitude Industries fuel programmer. I was hoping to add just a bit more power and was thinking about doing some minor motor work: Cams, piston, port and polish. I was told to go have my motor professionally...

who runs what exhausts and y? what full set ups work the best in ur opinion? what company brings the most power to the wheels? go ahead brag ;)