Switzer has a great rep and build quality in both the Porsche platform and the gtr. A friend of mine had a p800 gtr that ran great and upgraded to their USE package which was 900-950awhp on 93 pump gas and was a very fast car and well built.
I'd be all about this too if it wasn't for the price. I'd imagine this is thousands of dollars and you need to have someone who is seriously legit be able to install it all as a kit. I wouldn't be surprised if you can only get it done by them.
I love my truck, but I'll be honest I would rather go on a $10,000 vacation than chase after that much horsepower. To those who do eventually hook up with these guys... guaranteed you'll love it... and post the cool videos of the burnouts so I can live vicariously while vacationing in Hawaii. Lol