The Nitro Flash Hand Held Programmer and Diagnostic Code Reader. Recalibrates the speedometer to adjust for tire size and rear-end ratios. The horsepower gains on it Tow/RV Mode is a 85 hp &
200ftlbs of torque High Performance is 110hp and 250Ftlbs of Torque.
Reads over 200 Diagnostic Trouble Codes. It fits all Duramax engines LB7 and LLY 2001-2006 in CK2500, 3500, 4500 and 5500 Series trucks.

Three choices for Speed Limiter;
1. Stock 98MPH
2. 130MPH
3. Unlimited. 100HP/200FPT