mattlerose

I just got a black on black 2004 SE about 3 weeks ago. I would like to get opinions on things I can do to get more power for the mid range. Has good take off speed but would always like more too. This is my first Nissan and I don't know much about upgrades. Would a new exhaust system help? Do they have the upgrade computer chips for these cars like others? Thanks for any help. You can email me at MattLeRose@aol.com
Also what can I look to spend for total job of getting XM installed?