Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is engineered for Ram truck owners who want serious sound and genuine performance in one bolt-on package. Purpose-built for the 2014-2018 Ram 2500 with the 5.7L V8 in Crew Cab Long Bed and Standard Bed configurations, this American Thunder system delivers the aggressive tone Flowmaster is known for — heard clearly both inside and outside the cab — without sacrificing everyday drivability.
At the heart of the system is a stainless steel 50 Series HD muffler, tuned to produce an aggressive-to-moderate sound level that comes alive under throttle while staying comfortable at cruise. The kit routes exhaust through mandrel-bent piping to reduce restriction and maximize flow, unlocking the performance benefits you’d expect from a premium cat-back upgrade.
Key Benefits
This is a true bolt-on DOR/DOS (Dual Out Rear / Dual Out Side) design, giving you a dual tailpipe layout that pairs muscular looks with improved exhaust flow. The system features a 3.00″ inlet diameter feeding into dual 2.50″ stainless steel tailpipes, finished with polished 3.50″ stainless steel tips featuring an embossed logo for a clean, factory-plus appearance. The clamp-on mount type and included hardware make installation straightforward.
- American Thunder series cat-back system with aggressive/moderate sound level, tuned for tone inside and outside the truck
- Stainless steel 50 Series HD muffler included (black finish) for durability and signature Flowmaster sound
- Mandrel-bent piping (silver) with 3.00″ inlet and dual 2.50″ stainless steel tailpipes to reduce restriction
- Polished 3.50″ stainless steel tips with embossed logo for a finished look
- Dual tailpipe DOR/DOS layout with clamp-on mounting and all necessary installation hardware
- Backed by Flowmaster’s Lifetime Limited Warranty
Options & Configuration
The complete kit arrives with the muffler included and everything required for a clean, straightforward installation — no guesswork on parts and hardware. The dual-out design offers both rear and side exit routing, so you get the aggressive stance and sound profile that suits your truck.
Fitment
This system is designed specifically for the 2014-2018 Ram 2500 equipped with the 5.7L V8 engine in Crew Cab Long Bed or Standard Bed models, with 4WD applications covered. It is an emissions-legal, CARB (California) compliant system. Please note: this exhaust does not fit trucks equipped with the optional air bag suspension. This product carries a California Proposition 65 warning.
If you’re after a proven, aggressive-sounding upgrade that bolts on and performs, the Flowmaster American Thunder cat-back delivers the flow, the tone, and the long-term backing of a Lifetime Limited Warranty.
