Guys, I have a lightly used Husqvarna 338xpt in original condition. I am wanting to do a muffler mod to it. No other porting, head or skirt mods planned for right now. The plan is to tig in a length of tube into the muffler. What I need to know is....... What should the ID of the tube be? Locate it where on the muffler? Point it down at 45 deg? Angle it forward or rear-ward? Or perpendicular to the muffler face? Pics of this mod and feedback regarding the effect, positive or otherwise, would be appreciated! Thank you.