I ran the Quad XZT first.
Now I'm running the Triple Dog on Performance Level (90hp).
I tried running the Quad & the Triple Dog on the Tow level (50hp or so), but it was too much for my transmission. Slipped like crazy.
So now I'm just doing the Triple Dog.
Very much worth the money, and it has a lot of extra options for the '06 to program stuff... lights, seatbelt ding, foglights, etc.