Banks Power Pack
I have the Banks Power Pack on my '99. I did the install myself. I will warn you that the instructions they provide will make you scratch your melon a little but they are adequate (barely)
. Immediately after installation, my torque converter was slipping and I was getting a surging effect at freeway speeds. The fix for this is to have the pcm reflashed (you dealer will need to do this). Apparently, my truck was "slipping" before the Banks install, it just wasn't very noticeable. There are plenty of Banks friendly dealers out there. I just disconnected the MAP sensor from my automind when I dropped mine off, effectively disabling it. I've heard people talk poorly about Banks customer service. I haven't found this to be the case. They were very helpful when I called (more than a few times). Jeff S. , who is a TDR member works in their customer service department (x-4342) and he is tremendously helpful. As far as I am concerned, the product is top notch and I love mine. Hope this helps. 
I have the Banks Power Pack on my '99. I did the install myself. I will warn you that the instructions they provide will make you scratch your melon a little but they are adequate (barely)

