2004.5-2008 Duramax LLY Topkick TS PERFORMANCE MP-8 Pro
Plug & Play
Does not leave fingerprint in the factory computer
Excellent Choice for towing
Does not increase exhaust temperatures & increases fuel mileage.
The MP-8 offers a 2-4mpg increase!
Stock to 30% Horsepower Gain!
Easy to install with step by step instructions