Shop MagnaFlow Performance Exhaust Systems for the 1968 Plymouth GTX, including 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. 1968 Plymouth GTX exhaust options include 2.5-inch main piping diameters; polished exhaust tip finishes; dual split rear exit styles. Use Shop by Vehicle to find the system for your GTX.