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This is our ALL NEW GN1Performance "4" Inch Single Shot Cat Back Exhaust System" for a 1986 or 1987 Buick Grand National, T Type, or Turbo T 3.8 liter turbo V6. This 4 inch exhaust kit comes complete with a custom muffler, clamps, and hangers which is everything you need to bolt this kit on your car today! This kit is a direct "bolt in" no welding or cutting is needed! The system is constructed out of 304 stainless steel and features a high polish finish. The exhaust system is polished stainless and looks beautiful under the car.