Exhaust System Kit. Cat-back System 409S – Dual Rear or Side Exit – American Thunder – Moderate Sound. 817647, American Thunder Kit, flowmaster, magnaflow, walker, catco, ap, exhaust, kit, 2013, ram, 2500, 3500, 5.7, 5.7l, hemi, v8, truck. Flowmaster’s American Thunder Cat-Back exhaust system for the 2013 Ram 2500 and 3500 trucks is perfect for the person looking for improved horsepower and torque, with a deep performance tone inside and outside of the truck. This bolt-on DOR (Dual Out Rear) or DOS (Dual Out Side) emissions-legal system for the 5.7L Hemi V8 engine features a 3.00″ front pipe that runs back to a 50 Series HD muffler and dual 2.50″ mandrel bent stainless steel tailpipes. The tailpipes are supplied with two different exit locations for the customer to choose from. The system includes 3.00″ polished 304S stainless steel tips. The exhaust system is manufactured in the USA and is covered by Flowmaster’s Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.. . Fits 2013 Ram 2500 and 3500 Trucks with a 5.7L Hemi V8 engine. Does not fit Chassis Cab.. WARNING: This product can expose you to chemicals including nickel (metallic) and chromium (hexavalent compounds) which are known to the State of California to cause cancer and birth defects, or other reproductive harm (For more information go to www.p65warnings.ca.gov). California Proposition 65 Required. Yes. . California Proposition 65 Chemical Name 1. California Proposition 65 Chemical Name 1. Nickel (metallic). . Muffler Series. 50 Series HD. . Outlet Diameter (in). 2.5. . Single Dual. Dual. . Title. Flowmaster 817647 Cat-back – Dual Rear or Side Exit – American Thunder – Moderate Sound. . Sound Level. Moderate Sound Tubing Diameter (in). 2.5. . System Type. Cat-back System. . 2WD/4WD. RWD/4WD. . Tip Diameter (in). 3. . Tip Length (in). 12. . Tip Quantity. . 2. . Bullet Point #1. Stainless Steel Construction. . Bullet Point #2. Dyno Tuned For Maximum Performance. .