Join Date: Nov 2013
Location: Virginia Beach, Va.
Thanked 179 Times in 158 Posts
ATV: 2013 550 Core
Keep your muffler stock!
550 EFI's run like crap if you do any muffler mods.
As for cleaning the spark arrestor, spray it with carb or brake cleaner and use a wire brush to get any carbon deposits off.
When your re-tapping the holes, be slow and use lots of oil. There are metal blocks or nuts welded to the back of the muffler where the bolts go thru. It's a lot thicker there than just a inch away.
2013 550 Core, AC Hand Guards, Zilla 27's, RTR Steer Light & Shock Bushings, Auto Resetting Brkrs, Fnt & Rr Brush/Bumpers, RAM X Mnt & Cup Hldr, Champion 3klbs Winch, AmSteel 3.5Klbs Syn Rope, Braided Hook Strap, Rowe Anodized Billet Alum Fairlead, Bostitch 28" wtrprf box, Reese Tow Hook, DYI Web Catchers, Koplin Overfenders, Dr. Pulley Primary Sliders, 2ndry B3 Clock, DDM HID 35w 8K Kit, CREE LED light bar, green LED low beams and green Oznium 3W LED bullet running lights. 2" Moose Lift.