GAD or MSL are the 2 companies that crop up on here . GAD are always on here advising . Update your profile with where you live buddy and someone will recommend someone (hopefully )Do engine tuners like Superchips and Racechip really work? Do they really improve the acceleration and fuel efficiency of a vehicle?
Chips can up the power, they won't up the fuel economy - you'd be better off with a remap and dyno from one of our forum supporters as they will tailor the remap to your vehicle and you'll get before and after readings.