What does srl stand for... what will the cost of these tunes be...
directly from his site, for the abbreviations, description might differ though
Street Race Lite (SRL) - Awesome daily driver file (no towing) with butt kicking response, low smoke, and outrageous power. The best shifting all-around street file on the market period! Typical gains of 1-3 MPG have also been reported with this file.
Studded SRL (SRL+) - The one up to SRL for studded trucks. Simply adds boost over SRL for 10-15 more HP and 50-60 more FT/LBS of torque.
8000 Lb Tow (8K Tow) - This tow file is rated for 8000 pounds of towing without being studded. Studded trucks can tow 13000 pounds with this file.
Unlimited Tow - Since this file maintains stock fuel parameters, it can tow whatever you want while giving better shift firmness than stock.
Extreme SRL - Coming Soon!
Here's an example of what Gearhead can do for your truck. Here are runs on a stock-injector 6 liter with just an exhaust. This depicts Stock versus our "8K Tow" and "Street Race Lite" files.