American Thunder Header-Back Exhaust System Aluminized With Dual Tail-Pipes 1967 - 1970 - Flowmaster
Part #: 21427
Manufacturer Part #: 17281
Exhaust System, American Thunder, Header-Back, 2-1/2 in Diameter, Dual Rear Exit, 3 in Polished Tips, Steel, Aluminized, Ford Mustang 1967-70, Kit
SEE IMPORTANT INSTALLATION NOTES BELOW
Flowmaster American Thunder Crossmember-Back Exhaust System
Fits 1967-1970 Ford Mustang with V8 engine and headers. Aluminized Steel. - Aggressive to moderate sound
For the person who is looking for a true dual crossmember-back exhaust system with an moderate to aggressive exhaust tone. With an easy fit in mind, these systems are constructed from 16-gauge mandrel-bent aluminized steel tubing with a built-in H-pipe crossover. The pair of specially selected Super 44 Series performance mufflers flows into 2.50-inch mandrel-bent tailpipes and includes all hangers and hardware necessary for installation. This system fits through the factory rear valance exhaust cutouts and includes a pair of 3.00-inch polished stainless steel tips. The American Thunder systems deliver a moderate to aggressive interior and exterior tone and are best suited to the enthusiast who wants their performance to be heard. Like all Flowmaster exhaust systems, the benefits include improved throttle response, power and mileage. All aluminized steel exhaust systems are covered by our 3-year Limited Warranty. If you prefer stainless steel construction, check out optional system# 817281 which is covered by out Lifetime Limited Warranty. Notes: Does Not fit convertibles or cars with staggered shocks. Does Not include header reducer cones or downpipes for factory manifolds.
FEATURES:
- Super 44 Series Performance Mufflers for Deep Powerful Sound
- H-pipe Crossover for Maximum Power and a Deep Tone
- Mandrel-bent 16-gauge Aluminized Steel Tubing
- Includes Hangers and Hardware for Installation
- Aggressive to Moderate Exterior Exhaust Tone
- 3.00-inch Polished 304 Stainless Steel Tips
- Crossmember-back True Dual Exhaust System
- Does Not Include Header Reducer Cones or Downpipes for Factory Manifolds
- Over 35+ Years of Flowmaster Quality
- 3-Year Limited Warranty
SPECIFICATIONS:
- UOM: Kit
- Product type: Header-back exhaust system
- 2WD/4WD: 2WD
- Brand: Flowmaster
- Exhaust Series: American Thunder
- Exit Position: Dual Out Rear
- Heat Shield: No
- Inlet Diameter (in): 2.5
- Material: Aluminized Steel
- Muffler Flowmaster Part Number: 942546
- Muffler Quantity: 2
- Muffler Series: Super 44 Series
- Outlet Diameter (in): 2.5
- Product Type: Exhaust System
- Sale Category: Exhaust
- Single Dual: Dual
- Sound Level: Aggressive / Moderate
- System Type: Crossmember-back
- Tip Diameter (in): 3
- Tip Quantity: 2
- Tubing Diameter (in): 2.5
FITMENT:
- 1967 - 1970 Mustang Coupe & Fastback, V8, Non-staggered Shocks
IMPORTANT INSTALLATION NOTE: WILL NOT FIT CONVERTIBLES OR STAGGERED SHOCKS. MEANT FOR HEADERS. HEADERS/CONNECTOR MANIFOLD PIPES NOT INCLUDED. MAY REQUIRE SOME DRILLING FOR BRACKETRY.
Year | 1967, 1968, 1969, 1970 |
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Manufacturer | Flowmaster |
Truck Freight | No |
California Prop 65 | ![]() |