PLM Axle Back Exhaust Muffler Delete - Chevy Camaro V8 2010 - 2015 Stainless SteelPLM Private label Mfg. axle back exhaust, also known as muffler bypass, muffler deletes, or track pipes, are made of tig welded stainless steel and weighs at a remarkable 18 lbs, compared to the stock brick of mufflers. By removing the restrictive factory mufflers, PLM axle back exhaust will offer better throttle response, improved gas mileage, more hp, more tq, and of course, amazing sound! The piping of this track pipe has an outer diameter (OD) of