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 stainless steel tubing with a built-in H-pipe crossover, a pair of specially selected Super 44 Series mufflers and includes all hangers and hardware necessary for installation. 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. The tailpipes in this system exit under the rear valance with a turn-down in the tailpipes. Like all Flowmaster exhaust systems, the benefits include improved throttle response, power and mileage. If you prefer aluminized steel construction, check out optional system# 17282.
| Description_ABR |
SYS 67-70 MU |
| Description_SHO |
SYS 67-70 MUSTANG AM |
| Description_INV |
67-70 MUSTANG AMT UNDER VALNCE 409S |
| Description_ASC |
"Does not fit convertibles, staggered shock models, or cars with exhaust cutouts in the rear valance. |
| Description_DES |
Flowmaster American Thunder Crossmember-Back Exhaust System |
| Description_EXT |
1967-1970 Ford Mustang with V8 engine, 2.5" 409 Stainless Steel Pipes - Aggressive to moderate sound |
| Description_MKT |
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 stainless steel tubing with a built-in H-pipe crossover, a pair of specially selected Super 44 Series mufflers and includes all hangers and hardware necessary for installation. 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. The tailpipes in this system exit under the rear valance with a turn-down in the tailpipes. Like all Flowmaster exhaust systems, the benefits include improved throttle response, power and mileage. If you prefer aluminized steel construction, check out optional system# 17282. |
| Description_FAB |
H-pipe Crossover for Maximum Power and Deep Tone |
| Description_FAB |
Super 44 Series Mufflers for Deep Powerful Sound |
| Description_FAB |
Includes Hangers and Hardware for Installation |
| Description_FAB |
Mandrel-bent 16-gauge Stainless Steel Tubing |
| Description_FAB |
Moderate to Aggressive Exterior Exhaust Tone |
| Description_FAB |
Crossmember-Back True Dual Exhaust System |
| Description_FAB |
Does Not Include Header Reducers or Downpipes for Factory Manifolds |
| Description_FAB |
Lifetime Limited Warranty |
| Description_ABR |
SYS 67-70 MU |
| Description_SHO |
SYS 67-70 MUSTANG AM |
| Description_INV |
67-70 MUSTANG AMT UNDER VALNCE 409S |
| Description_ASC |
"Does not fit convertibles, staggered shock models, or cars with exhaust cutouts in the rear valance. |
| Description_DES |
Flowmaster American Thunder Crossmember-Back Exhaust System |
| Description_EXT |
1967-1970 Ford Mustang with V8 engine, 2.5" 409 Stainless Steel Pipes - Aggressive to moderate sound |
| Description_MKT |
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 stainless steel tubing with a built-in H-pipe crossover, a pair of specially selected Super 44 Series mufflers and includes all hangers and hardware necessary for installation. 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. The tailpipes in this system exit under the rear valance with a turn-down in the tailpipes. Like all Flowmaster exhaust systems, the benefits include improved throttle response, power and mileage. If you prefer aluminized steel construction, check out optional system# 17282. |
| Description_FAB |
H-pipe Crossover for Maximum Power and Deep Tone |
| Description_FAB |
Super 44 Series Mufflers for Deep Powerful Sound |
| Description_FAB |
Includes Hangers and Hardware for Installation |
| Description_FAB |
Mandrel-bent 16-gauge Stainless Steel Tubing |
| Description_FAB |
Moderate to Aggressive Exterior Exhaust Tone |
| Description_FAB |
Crossmember-Back True Dual Exhaust System |
| Description_FAB |
Does Not Include Header Reducers or Downpipes for Factory Manifolds |
| Description_FAB |
Lifetime Limited Warranty |
| Brand |
Flowmaster |
| California Proposition 65 |
Yes |
| California Proposition 65 Chemical Name |
Chromium (hexavalent compounds) |
| California Proposition 65 Chemical Name |
Nickel (Metallic) |
| CARB (California) Compliant |
Yes |
| Catalytic Converter Included |
No |
| 2874 |
0 |
| Category |
Exhaust |
| 3728 |
Flat Band |
| 1882 |
Yes |
| Emission Code |
5 |
| Exhaust Series |
American Thunder |
| 9874 |
Clamp-On |
| 1161 |
0 |
| Exhaust Tip Quantity |
Sold Separately |
| 10980 |
Round |
| 9870 |
Dual Out Rear |
| 200 |
Natural |
| 353 |
No |
| 3390 |
Performance |
| 4364 |
Yes |
| Heat Shield Included |
No |
| Inlet Diameter |
2.50 |
| 596 |
Weld-On |
| 9871 |
2.50 |
| 92 |
Yes |
| 11021 |
4.00 |
| 11022 |
13.00 |
| 11023 |
9.75 |
| 11064 |
Chambered |
| 11048 |
4.00 |
| 11049 |
13.00 |
| 11050 |
9.75 |
| 11073 |
Chambered |
| 9884 |
4.00 |
| 1892 |
13.00 |
| 4372 |
409 Stainless Steel |
| 4373 |
Oval |
| 9882 |
Black High-Temperature Paint Finish |
| 4367 |
No |
| 4368 |
No |
| Muffler Included |
Yes |
| 9962 |
Slip-Fit |
| 4365 |
2.50 |
| 4366 |
2.63 |
| 9963 |
Slip-Fit |
| 4375 |
1 |
| Muffler Part Number |
Kit Only |
| 4374 |
2 |
| Muffler Series |
Super 44 Series |
| 1174 |
Chambered |
| part type |
Exhaust System |
| 3530 |
409 Stainless Steel |
| Product Type |
Exhaust System |
| Sound Level |
Aggressive / Moderate |
| 4377 |
No |
| Sub Category |
Exhaust and Tail Pipes |
| 4369 |
2.50 |
| 4376 |
2 |
| Tail Pipe Quantity |
Dual |
| 4370 |
No |
| Type |
Crossmember-back |
| 6014 |
No |
| 2126 |
Not Applicable |
| Warning |
California Proposition 65 |
| Pipe Color |
Silver |
| Drive |
2WD |
| 9885 |
9.50 |
| Brand |
Flowmaster |
| California Proposition 65 |
Yes |
| California Proposition 65 Chemical Name |
Chromium (hexavalent compounds) |
| California Proposition 65 Chemical Name |
Nickel (Metallic) |
| CARB (California) Compliant |
Yes |
| Catalytic Converter Included |
No |
| 2874 |
0 |
| Category |
Exhaust |
| 3728 |
Flat Band |
| 1882 |
Yes |
| Emission Code |
5 |
| Exhaust Series |
American Thunder |
| 9874 |
Clamp-On |
| 1161 |
0 |
| Exhaust Tip Quantity |
Sold Separately |
| 10980 |
Round |
| 9870 |
Dual Out Rear |
| 200 |
Natural |
| 353 |
No |
| 3390 |
Performance |
| 4364 |
Yes |
| Heat Shield Included |
No |
| Inlet Diameter |
2.50 |
| 596 |
Weld-On |
| 9871 |
2.50 |
| 92 |
Yes |
| 11021 |
4.00 |
| 11022 |
13.00 |
| 11023 |
9.75 |
| 11064 |
Chambered |
| 11048 |
4.00 |
| 11049 |
13.00 |
| 11050 |
9.75 |
| 11073 |
Chambered |
| 9884 |
4.00 |
| 1892 |
13.00 |
| 4372 |
409 Stainless Steel |
| 4373 |
Oval |
| 9882 |
Black High-Temperature Paint Finish |
| 4367 |
No |
| 4368 |
No |
| Muffler Included |
Yes |
| 9962 |
Slip-Fit |
| 4365 |
2.50 |
| 4366 |
2.63 |
| 9963 |
Slip-Fit |
| 4375 |
1 |
| Muffler Part Number |
Kit Only |
| 4374 |
2 |
| Muffler Series |
Super 44 Series |
| 1174 |
Chambered |
| part type |
Exhaust System |
| 3530 |
409 Stainless Steel |
| Product Type |
Exhaust System |
| Sound Level |
Aggressive / Moderate |
| 4377 |
No |
| Sub Category |
Exhaust and Tail Pipes |
| 4369 |
2.50 |
| 4376 |
2 |
| Tail Pipe Quantity |
Dual |
| 4370 |
No |
| Type |
Crossmember-back |
| 6014 |
No |
| 2126 |
Not Applicable |
| Warning |
California Proposition 65 |
| Pipe Color |
Silver |
| Drive |
2WD |
| 9885 |
9.50 |
| Year |
Make |
Model |
Submodel |
Notes |
| 1967 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1967 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1968 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1968 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1968 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1968 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1969 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1969 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1969 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1970 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1970 |
Ford |
Mustang |
Base |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1969 |
Ford |
Mustang |
Boss 302 |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1970 |
Ford |
Mustang |
Boss 302 |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1970 |
Ford |
Mustang |
Grande |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1970 |
Ford |
Mustang |
Grande |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1970 |
Ford |
Mustang |
Mach 1 |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1970 |
Ford |
Mustang |
Mach 1 |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1967 |
Ford |
Mustang |
Shelby GT-350 |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1968 |
Ford |
Mustang |
Shelby GT-350 |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1967 |
Ford |
Mustang |
Shelby GT-500 |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1968 |
Ford |
Mustang |
Shelby GT-500 |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1969 |
Ford |
Mustang |
Shelby GT-500 |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1970 |
Ford |
Mustang |
Shelby GT-500 |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes,Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
| 1968 |
Ford |
Mustang |
Shelby GT-500KR |
Aggressive to moderate sound; Exit under the rear valance with a turn-down in the tailpipes |
