Shop MagnaFlow Performance Exhaust Systems for the 2008 Pontiac G8, including axle back exhaust systems for select engines, trims, and configurations. Engineered to produce MagnaFlow's deep signature exhaust sound, these systems feature premium materials and easy direct-fit installation. 2008 Pontiac G8 exhaust options include 2.5-inch main piping diameters; polished exhaust tip finishes; quad split rear exit styles. Use Shop by Vehicle to find the system for your G8.