Here are some pics of the install of the NISMO cat back on my 08 Touring 6 spd.
Although it only gives you 6HP, the sound and quality are awesome. Coverd by Nissan 12 month warranty or 36 months if you have them installed when you buy the car like I did.
If HP is your primary goal, go with Stillen, HKS etc. If you're looking for a good looking quality system with a great sound and warranty, NISMO is worth the price of admission. They list for $1200 but you can find them from about $800 to $1000 plus installation. Installation looked pretty straighforward. Fits like a glove.
http://i75.photobucket.com/alb...4.jpg
http://i75.photobucket.com/alb...4.jpg
http://i75.photobucket.com/alb...3.jpg
http://i75.photobucket.com/alb...2.jpg
http://i75.photobucket.com/alb...1.jpg
http://i75.photobucket.com/alb...8.jpg
http://i75.photobucket.com/alb...5.jpg
http://i75.photobucket.com/alb...8.jpg
http://i75.photobucket.com/alb...1.jpg
http://i75.photobucket.com/alb...5.jpg
http://i75.photobucket.com/alb...4.jpg