A top to bottom overhaul, this new premium series is built with purpose through performance ability and materials to withstand the harshest of conditions. Constructed from front to back with 304 stainless steel, the Explorer Series is tougher, more powerful and built to last. With performance as a priority, you will find more horsepower throughout the entire RPM range. 304 stainless steel. Compact structure. Chambered / louvered core internals. No packing or repacking necessary. Removeable USFS Approved spark arrestor. Carbon fiber sleeved end tip(s). Laser cut Big Gun Exhaust heat shield.