Will my freinds injen cai work on my 05 sedan? his is on a 04 coupe? Should i just get a new one or just use his? will it still be the same hp?

Wow nobody knows anything on this damn site!

That's a great way to get answers.

You asked this question once already.
https://g35driver.com/forums/g35-sedan-v35-2003-06/53266-injen-cai-coupe.html

To answer your question... maybe.

I took my 2005 G35 6mt coupe to Injen and they had my car for one week and they said that there CAI intakes did not make any more power or touqe. They are tring to design a intake for the new 2005 with the 298 hp. Say with the stock air box and get a Ztube and K&N filter