I was pleasantly surprised to find that Mini-Madness is just a couple blocks from where I work in Hillsboro, OR. I dropped by and took a look. One could spend a lot here. Very tempting.
Anyway...I was quoted installation at $90/hour. Now, how many hours? Sorry, I don't remember exactly. The Stage 2 is probably 2-4 hours. I think the exhaust is the most involved. The Stage 3 is probably an 8 hour job, as there is a fair amount of under the hood work to be done and I think he said it could be finished in a day. But if you're gonna blow $6K on the kit, what's another grand for installation?
I too would like to hear from anyone with actual experience with these kits.