Shop MagnaFlow Performance Exhaust Systems for the 2008 Pontiac Grand Prix, including cat-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 Grand Prix 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 Grand Prix.