Do you guys know if any how to's exist for the Injen cai for the G35 coupe? I am installing one in my buddies car, and I want to make sure I don't screw it up. Thanks in advance....

These instructions, including audio and video clips, should help you out:

http://maherauf.home.comcast.net/g35/nismocai/

Good luck!

I think its pretty simple just google it