Question has probably been beaten to death, so one word answer will suffice

2002 Dodge Ram 1500 w 5.9l magnum. I THINK I read that I dont really need the shift engagements or something that is supposed to come with the new 3865 model. Im more interested in the power increase and for almost $100 cheaper, Id rather go with 3815.

 

If your main concern is power, I think you would be best with a sct canned tune by hemifever. It's probably a little more expensive, but at least you know you bought the best.

 

Id rather just go to the truck store here in town and buy one!
No offense, Im sure they are good, but something about having it by the weekend really apeals to me.

 

Actually, cheapest I found the 3865 is $294 shipped. Hard to beat that price! Stores in town go for $379ish
Guess i found my answer thanks

 

3865 is what i have and it is a great tuner, you getthe power and much more. multiple tunes, speedo calibration etc. and for that price you cant beat it