what's the difference between a roush 427r and a regular mustang gt?

Question

Accepted Answer

The **Roush 427R** is a substantial performance upgrade over a **regular 2007 Mustang GT**! Here are the key differences:

## 🔋 Power & Performance

| Spec | Mustang GT | Roush 427R | Difference |
|------|-----------|-----------|------------|
| **Horsepower** | 300 hp | ~435 hp | +135 hp (+45%) |
| **Torque** | 320 lb-ft | ~385 lb-ft | +65 lb-ft |
| **Engine** | 4.6L naturally aspirated V8 | 4.6L **supercharged** V8 (Eaton M90) | Forced induction |
| **0-60 mph** | ~5.1 seconds | ~4.6 seconds | Significantly quicker |

The 427R gets its name from its approximate horsepower output—it's basically a factory-supercharged Mustang with a Roots-style blower that pumps in extra air for serious muscle.

## 🚗 Chassis & Styling
- **Roush 427R** includes unique bodywork with aggressive styling, hood scoop, Roush badging, and premium interior touches like embroidered seats
- The 427R was built as a **post-title conversion** by Roush Performance—meaning these started life as regular GTs before being shipped to Roush for transformation

## 💰 Market Value
Based on Classic.com data:
- **S-197 I Mustang GT (2005-2009)**: Averages around **$21,200** (range $5K–$89K)
- **Roush 427R (S-197 I)**: Averages around **$30,600** (range $15K–$60K)

The 427R commands a significant premium (~$9K average) for that supercharged performance and limited production numbers—only **1,025 were built for 2007**.

## Bottom Line
Think of the 427R as a "factory tuner car" that bridges the gap between a stock GT and the wild Shelby GT500. It's the most accessible way to get supercharged V8 power in the S-197 generation with full warranty-backed engineering from a legendary name in Mustang performance.

Want to browse similar supercharged Mustangs? Check out the [Roush 427R market](https://classic.com/m/ford/mustang/5th-gen/s-197-i/roush/427r/) or the [regular S-197 I GT market](https://classic.com/m/ford/mustang/5th-gen/s-197-i/gt/) for comparison!

Lot 2400-SCT: 2007 Ford Mustang Roush 427R

Classic cars

Cars for sale

Resources

Lot 2400-SCT: 2007 Ford Mustang Roush 427R

Become a CLASSIC Insider