Flowmaster
Flowmaster 67-70 Mustang American Thunder Thru Valance Exhaust System
Why this price?
$899.95 is MSRP, the lowest price Flowmaster lets us list it at. Additionally, Pro members get $98.99 back on this part.
$899.95 − $98.99 = $800.96
Special Order
This part is still available to order. Once you place your order, we’ll submit it directly to Flowmaster, and they’ll ship it straight to you.
Delivery times can vary depending on the brand, so we can’t guarantee an exact arrival date. What we can guarantee is that we’ll stay on top of your order, monitor its progress, and keep you updated until it reaches your door.
Special-order items are typically not kept in stock by most retailers. By ordering through us, your order is placed directly with Flowmaster, assuring you get the part as quickly as possible.
Want to get an estimated delivery timeframe before ordering? Contact us through our contact page, and we’ll be happy to find out for you.
Not sure it fits? Read our tips.
Fitment tips
Fitment can come down to more than year, make and model. Sometimes the sub-model decides, so start with the fitment table below.
- Drive type. If your car is all-wheel drive, make sure the part is for all-wheel drive, not rear-wheel drive.
- Engine size. For engine parts, make sure the engine size on the product matches your engine.
- Transmission. Manual and automatic cars often take different parts.
- Body style. Sedan or hatch, two-door or four-door, cab and bed length on trucks.
Manufacturer data can sometimes have imperfections. Still not sure? We are happy to help.
Send us a message and we will confirm the fit.
Couldn't load pickup availability
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.
- Does Not Include Header Reducer Cones or Downpipes for Factory Manifolds
- Super 44 Series Performance Mufflers for Deep Powerful Sound
- H-pipe Crossover for Maximum Power and a Deep Tone
- Includes Hangers and Hardware for Installation
- Mandrel-bent 16-gauge Aluminized Steel Tubing
- Aggressive to Moderate Exterior Exhaust Tone
- 3.00-inch Polished 304 Stainless Steel Tips
- Crossmember-Back True Dual Exhaust System
- Over 35+ Years of Flowmaster Quality
- 3-Year Limited Warranty
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1967-1970 | Ford | Mustang | Base |
| 1969-1970 | Ford | Mustang | Boss 302 |
| 1969-1970 | Ford | Mustang | Boss 429 |
| 1970 | Ford | Mustang | Grande |
| 1970 | Ford | Mustang | Mach 1 |
| 1967-1970 | Ford | Mustang | Shelby GT-350 |
| 1967-1970 | Ford | Mustang | Shelby GT-500 |
| 1968 | Ford | Mustang | Shelby GT-500KR |
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