The only benefit from having the dealer install it is the remainder of your factory warranty vs. just a 1 year. But..if you're nearing 36K or so just go with another shop's install or DIY. I would only go with someone who has installed superchargers before though.
I have been looking into the SC and installation at local dealerships in the area. I spoke to several techs who all say they have not installed one. One tech said they sent a 4 runner out to a performance shop to install the SC! Maybe I will wait until I hear more dealerships saying they can do them,and maybe then the unit price can drop by $1500.
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6" Fab Tech Lift, Bushwackers, 20" BBS wheels Nitto Terra Grappler 325/60/20 All Terrain tires. Spyder Trax 1.25 spacers Scuba mod, Manik tail light guards, Hunter GT807 full brush guard, Predator step bars, diamond plate interior trim, dual cd's, leather seats, Toyota Trail Team Badge.
I chose to have the dealer install it solely to keep the full factory warranty. It only had 200 miles on the odometer when it went in, so I figured paying a little extra on the front end was a pretty safe expense. The install looks clean and everything runs well, so far.
You can ship the ecm unit to a Good dealership and they flashed the ecm with the new fuel/timing maps the SC comes with the map, you just need in tranfered to the ecm unit.
WOW! 
What a markup!!!:
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