Programmers
 

1st post.......Here we go. I am a new member and know probably that this is an old topic but am interested in the programmers. Do they work and are they worth the money if they do work. What is the recommended one that everyone uses? I have an 04 GMC HD with the 6.0 liter engine. I use the truck to tow a 32' travel trailer and could always use more power. Thanks.....