Hey guys, had to register to post this since I figured it was useful info.
I'm a BestBuy MECP Advanced certified install tech and stumbled upon this thread while doing some research into the subject.
I had a 2009 Touareg for a Viper4204 remote start today. It took literally like all day, and getting to one pesky wire required removal of the wipers/cowl panel (which ate up a good chunk of the time)... but in the end everything worked great; no warning lights, no electrical gremlins.
Of course the install requires the owner to loose a key that gets buried under the dash (wrap-a-key method as installers say), but there's no other huge costs associated with it. Cost to the client is around $550+tax for the viper 2 way remote starter I listed.
If anyone ever has questions or anything feel free to contact me. I'm in the great state of Wisconsin, but I'm networked with tons of people across the nation, I can refer to someone who can do a quality job. Gimme a hollar at 715-343-7300.
Hope that wasn't too business-y... it wasn't supposed to be, but I think it came off that way. Anywho, cheers, glad I could have the pleasure to work on this darn VW/Porsche monster... and I thought the Audi Q7 was a bugger of an install