I have a 2003 5.9L gasoline quad cab. I've already put a Volant Cold Air intake on it, and a GF Performance Chip. I want to know if there is tuners like Bully Dog that will work with my truck. And other stuff like the Jet chips?

 

You LOST performance when you installed that joke called a GF Chip on it. Yank it off, it's an internet rip-off.



Best gains I've seen out of a tuner for the 5.9 gasser is the Superchips Flashpaq.

 

I second that. Use superchips I believe it's something like up to 25hp gain on those 5.9's. I wouldn't have bothered with a CAI so early hoping to see performance out of it. You really need to do your exhaust first or along side it to get anything from a CAI. Real world dyno numbers have shown this time after time. The way the trucks are set up from the factory the stock airbox and throttle body provide enough airflow to basically maximize the performance you'll get out of the factory exhaust manifolds/Y/catback.

That being said I'd say the tuner is probably your best bang for the buck in terms of performance gains. Next on the list I'd check out exhaust. Gears might help significantly for acceleration. After that you might consider moving on to a camshaft swap and some of the better torque converters. Take it one step at a time

 

Thank you HammerZ71, and popdog. The GF chip really did help my truck. But I guess Superchip is the way to go. Now what about, stuff like bully dog, and daiblo.

 

Do a search on Google for the GF chip and see just how many people like it. It is nothing but a 20 cent resistor in a black box with two wires on it.

http://www.youtube.com/watch?v=qUjAI9ZGXkY

 

i have a 5.9 gasser and i got the superchip flashpaq....and it does give you some power, and it does help a lil on my MPG,s and im running 35" muds on mine