Enter Garage
Representative imageManufacturer information. Check the part number and installation requirements for your vehicle.
Supplier details checked 2026-09-23 · Test catalog
1968-1970 Mopar B-Body with V8 engine, 3.0" - Aggressive sound
Flowmaster American Thunder Crossmember-Back Exhaust System
Does Not Include Header Reducer Cones or Downpipes for Factory Manifolds
Crossmember-Back True Dual 3.00-inch Exhaust System
H-pipe Crossover for Maximum Power and Deep Tone
Super 40 Series Mufflers for Deep Powerful Sound
Includes Hangers and Hardware for Installation
Mandrel-bent 16-gauge Aluminized Steel Tubing
Moderate to Aggressive Exterior Exhaust Tone
Dyno Tuned for Maximum Performance
Includes 3-year Limited Warranty
Easy to Follow Instructions
Does Not include header reducer cones or downpipes for factory manifolds.
Flowmaster 68-70 Mopar B-BODY 3.0in. American Thunder Crossmember-Back Exhaust System
6870 MOPAR BBODY 30 AMT
SYS 68-70 MOPAR B-BO
This American Thunder system is a true dual exhaust system featuring large 3.00-inch mandrel-bent aluminized steel tubing with a built-in H-pipe crossover assembly flowing into a pair of Super 40 Series performance mufflers. The mufflers deliver a moderately aggressive exterior sound with a moderate interior tone for enthusiasts who want their performance to be heard. The dual 3.00-inch mandrel-bent tailpipes exit straight out the back under the rear bumper. The kit does not include exhaust tips, allowing you to choose the tips of your choice, or run the pipes as is for a muscular look. Includes all necessary hardware, parts and easy to follow instructions. Like all Flowmaster systems, the benefits include improved throttle response, power, mileage and is covered by our 3-year Limited Warranty.
SYS 68-70 MO
