4. SCT
SCT's flagship tuner, the Livewire all-in-one device, gives '08 Super Duty owners an 85-rwhp and 151-lb-ft torque power gain. The new 6.4L enabled Livewire features both towing and performance tunes for the engine and one additional tune for the transmission. You can also purchase the Extreme 6.4L Race Package to give your truck over 120 rwhp and 230 lb-ft of torque.

(866) 297-6298

5. Pro Comp
Pro Comp's new Accu Pro calibration tool is the perfect upgrade for lifted vehicles. The Accu Pro allows for speedometer and odometer calibration for tire size and/or differential-gear changes. No more wondering how fast you're traveling or what the mileage on your vehicle really is. It can also read and clear vehicle DTCs.

Explorer Pro Comp
(619) 216-1444

6. Edge
The Evolution from Edge Products is available for late-model Ford and GM diesels, '97-'08 F-150s, '07-and-later GM gas-powered trucks and SUVs, and '07 Dodge Hemi trucks. You can choose from up to four different power levels-Level 4 adds 100 hp and 210 lb-ft of torque. You'll also see improvements in fuel economy and towing capability. Other features include: display and clear diagnostic trouble codes, adjust for nonstock tires, adjust speed and rev limiters, and monitor and display EGTs.

Edge Products
(888) 360-3343

7. Fast
The FAST-Flash power programmer makes the tuning process easy for even first-time users. FAST-Flash offers three distinct settings: performance, towing, and economy. As a bonus for all GM vehicles, there is a Cam Tuner menu to select additional programming for optimizing most performance camshafts.

(800) 999-0853

8. Hypermax
The Hypermax Mach 7 performance module for '03-'06 6.0L Power Stroke diesels plugs directly into your vehicle's module harness. Once installed, the Power Stroke will pump out 475-plus horsepower and 820 lb-ft of torque on the highest of seven settings. You can also get a 10-percent increase in fuel economy on the Super Cruise setting. Do-it-yourself installation instructions are included.

Hypermax Engineering
(847) 428-5655

9. Hypertech
Use less fuel and get more power with Hypertech's new E-CON economy power programmer. The E-CON is designed for the driver who needs better fuel mileage and more power but doesn't want to pay for other high-performance features. Every E-CON is programmed with Hypertech's Max Energy tuning, diagnostic, and back-to-stock options. The E-CON also comes with a USB cable and a CD containing software to enable quick updates over the Internet.

(901) 382-8888

10. Quadzilla
The Stealth 2 for '07-'08 LMM Duramax diesels offers up to six different tuning levels, mileage gains of 10 to 15 percent, and increases of 135 hp and 300 lb-ft of torque. The Stealth 2 includes the ability to calibrate the speedometer, remove the speed limiter, reset the transmission learning, and watch a full set of real-time data parameters. The Stealth 2 has DPF-friendly tuning and can perform a manual regeneration. The unit is USB-compatible for new updates, and all of the USB updates are free for life.

Quadzilla Performance Technologies
(888) 842-6572