RE: ECM Programmers
really depends on who you ask. Each have different options, but in the end are all pretty similar. What you really should do is get your computer reprogramed. This will net you alot more performance for about the same cost. Also you have alot more adjustments you can chose.
08' Silverado Crew Cab Z-71 Duramaxx Stock, for now.
Plans - Programmer, 6" lift, 37s, outrunning my employee's cayanne