how do i add torque and horsepower to my gmc envoy?

[C R]

i have a 2003 gmc envoy sle with a 4.2l engine L6 . i want to add more hp and torque, but am more interested in the torque.

 

[Molson02536]

i have a 2003 gmc envoy sle with a 4.2l engine L6 . i want to add more hp and torque, but am more interested in the torque.

Best thing to do is to get your Envoy Dyno tuned, or try http://www.pcmforless.com/. Alvan and Kelly at PCMFORLESS are two of the best tuners for the 4.2 L6 and they should wake your Envoy right up. If there to far for you, just look around your area for a speed shop that can custom tune your ECM for engine power torque and transmission performance to match the engine tune. It is so worth dyno tuning, 23.8 hwy and 19.1 city is what I am getting now in my 4.3 Jimmy. Huge power improvement. Good luck and hope this helps.