Flowmaster
Flowmaster 67-70 Mustang American Thunder Under Valance Exhaust System
Why this price?
$849.95 is MSRP, the lowest price Flowmaster lets us list it at. Additionally, Pro members get $93.49 back on this part.
$849.95 − $93.49 = $756.46
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, a pair of specially selected Super 44 Series performance mufflers for a deep powerful sound. The 2.50-inch mandrel-bent tailpipes feature a slight turndown at the rear bumper and the system 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. 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 with a Lifetime Limited Warranty, check out exhaust system# 817282. Notes: This system Does Not fit convertibles, cars with staggered shocks or exhaust cutouts in the rear valance. Does Not include header reducer cones or downpipes for factory manifolds.
- Does Not Include Header Reducers or Downpipes for Factory Manifolds
- H-pipe Crossover for Maximum Power with a Deep Tone
- Super 44 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
- Crossmember-Back True Dual Exhaust System
- 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 |
| 1967-1968 | Ford | Mustang | Shelby GT-350 |
| 1967-1970 | Ford | Mustang | Shelby GT-500 |
| 1968 | Ford | Mustang | Shelby GT-500KR |
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