001 Brenspeed Two Valve
Michael Johnson
Technical Editor
February 5, 2019

Quite possibly the most overlooked Mustang engine is the Two-Valve modular engine found under the hood of 1996-2004 Mustang GTs. Starting out with 215 horsepower in the 1996 GT, by the time it found its way into the 1999-2004 New Edge GTs, it was making 260 horsepower thanks to revised heads, improved intake design, and increased compression. Unfortunately, the 2005-2010 Mustang GT’s Three-Valve made 305 horsepower, and Shelby GT500s with a supercharged 5.4 engine made 500 horsepower. We don’t even need to get into how popular the 2011-2019 Coyote engine has become you already know.

For these reasons, the Two-Valve has become the forgotten engine. However, that hasn’t negatively impacted the popularity of SN95 and New Edge Mustangs with a Two-Valve powerplant. What it has done, though, is made the two Mustang generations very affordable. Therefore, the cars still enjoy a huge following by enthusiasts looking for a cool Mustang that may not be blistering fast, but one they can still be proud of. Plus, if you’ve ever heard a Two-Valve with cams and a nice exhaust, you know there’s not a better sounding Mustang.

Brenspeed, another Mustang shop mostly known for its Coyote performance prowess, recently took a 2004 Mustang GT under its wing for intake, exhaust, and valvetrain upgrades. Brenspeed added Kooks long tube headers with the company’s high flow X-pipe, an SLP Loudmouth after-cat exhaust, QTP electric cutouts, Comp Cams Stage 1 cams and valvetrain components, BBK 78mm throttle-body and plenum, Steeda Autosports underdrive pulleys, and NGK spark plugs. Brenspeed’s Brent White tells us the car already had a K&N cold air on it.

From a drivetrain standpoint, the GT features an Exedy Mach 400 clutch and lightweight flywheel, Ford Performance adjustable clutch cable and aluminum driveshaft, a Stifflers driveshaft loop, BBK upper and lower control arms, Stoptech slotted rotors, and Hawk pads.

Once Brenspeed finished the intake and exhaust upgrades, White tuned the car using an SCT X4 handheld. With most stock Two-Valves coming in around 230 horsepower at the wheels, Brenspeed’s 2004 Mustang GT spun the rollers to 291 horsepower and 319 lb-ft of torque at the wheels. We’ve seen similar gains on our own project cars, and it’s not uncommon to see a 50-60 horsepower using various intake and exhaust mods, with a custom tune.

Sure, a Two-Valve is still a power adder away from making Coyote power, but in a New Edge with the right gearing, and the right exhaust, even 300 horsepower is fun.

Photography by Michael Johnson