15817 These Builder Series tailpipes are constructed from 2.50-inch mandrel-bent 16-gauge aluminized steel tubing for maximum flow, tuck up high in the chassis for good clearance and exit straight-out the back under the rear bumper. Designed to be used with Side Inlet/Opposite Side Outlet mufflers such as part# 942548 (Super 44 Series) or 942553 (50 Series) mufflers. Covered by our 3-year Limited Warranty. Note: Not designed to fit in factory bumper exhaust cutouts. Some fitment may be necessary. Does Not include installation hardware or exhaust tips. Features: Exits Straight-out under the Rear Bumper Mandrel-bent for Maximum Performance High Clearance around Rear Differential Designed for Double Off-set Mufflers 16 Gauge Aluminzed Steel Tubing Does Not Include Hardware 3-year Limited Warranty About Flowmaster Flowmaster® is a household name, and for good reason. They've built legendary exhaust systems and mufflers for decades, and now offer performance air intakes, catalytic converters, and headers to give your hot rod performance to match the iconic Flowmaster sound. SPECS Automotive Item Grade High Performance Brand Flowmaster Color Gray Emission Code 5 Exit Position Dual Rear Exit Fitment Direct OE Replacement Inlet Diameter (in) 2.5 Material Aluminized Steel Outlet Diameter (in) 2.5 Overall Length (in) 65.25 Product Type Exhaust Accessories System Type Tailpipe Kit Tubing Diameter (in) 2.5 UPC 700042014866 California Proposition 65 Required No Part Number 15817 Warranty for Part# 15817 Fits 1978-1988 GM G-Body. Use with Side Inlet/Opposite Side Outlet mufflers.