17104 Flowmaster is proud to introduce our American Thunder dual exhaust system for 1967-1974 Camaro and Firebird, and 1968-1974 Nova. The system features our exclusive 80 Series Crossflow performance muffler that tucks up high behind the rear differential. Other features include all mandrel-bent dual 2.50-inch head pipes with a built-in H-pipe crossover and dual 2.50-inch tailpipes for a deep rich sound and optimum performance. This crossmember-back aluminized steel exhaust system gives these classic muscle cars a moderate tone inside and out. The system includes all parts, hardware and illustrated instructions and is covered by our 3-year Limited Warranty. If you prefer Stainless steel construction, check out optional system# 817104 which comes with a Lifetime Limited Warranty. Notes: Does not include manifold downpipes or header reducer cones. Convertible models will require adding 3/8-inch of shims to the stock factory X-brace for clearance or purchasing Hotchkis Performance Convertible brace Part# 1404. Features: H-pipe Crossover for Maximum Power and Deep Tone Includes Hangers and Hardware for Easy Installation Mandrel-bent 16-gauge Aluminized Steel Tubing Does Not Include Manifold Downpipes or Header Reducers Moderate Exterior Exhaust Tone Maximum Ground Clearance Crossmember-back System 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 2WD/4WD 2WD Brand Flowmaster Emission Code 5 Exhaust Series American Thunder Exit Position Dual Out Rear Heat Shield No Inlet Diameter (in) 2.5 Material Aluminized Steel Muffler Part Number 42585 Muffler Quantity 1 Muffler Series 80 Series Crossflow Outlet Diameter (in) 2.5 Product Type Exhaust System Single Dual Dual Sound Level Moderate System Type Crossmember-back Tip Quantity Not Included Tube Diameter 2.5 inch Tubing Diameter (in) 2.5 Type of Exhaust Crossmember-back UPC 700042013302 California Proposition 65 Required No Part Number 17104 EMISSIONS 5 This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations. TECH RESOURCES Instructions for Part# 17104 Warranty for Part# 17104 "Works with Factory manifolds or headers. Connector pipes not included.