Okay, a few things:
1) Street racing IS NOT cool. I don't give a dang who you think the better street racer is. If you feel the need to race, take it to the local track, dragstrip, or autocross course. Do not be racer on the street. That just gives the rest of us all a bad name, not to mention it puts other peoples lives at risk. This isn't F & F, this is real life. Stop trying to be a "street racer." There's nothing cool aobut trying to be a street racer, only stupidity.
2) DO A SEARCH!!!! This junk has been covered countless times. If you are SOOO much cooler and smarter because he doesn't know which intake is better, then why didn't YOU answer it?? Stop making fun of him. Just becuase he didn't know that doesn't mean he's dumb. Besides, none of us was born with this knowledge, we all had to go out and research to learn it.
As for intakes...you'll get approx a 1% gain in HP for every 11.1 degrees you lower the intake temp. Thats why a Cold Air Intake typically puts out a little more power than an short ram, and why they perform better in the late fall than middle of summer in Arizona. Typically, a CAI is around a 4-5hp gain max at most.
3) Try to make an effort to have better sentence structure and spelling.
4) As for Urethane kits...almost NO kit does a darn thing for track use. With the expection of Genuine Mugen, I know of no one that wind tunnel tests their kits for airflow. Urethane vs. fiberglass. Nothing to do with weight, racing, speed etc. For the most part, Body kit, like those big ass awful wings, are for looks.
A Urethane kit will be harder to break. They can't be molded though, so make sure you get a good one with gaurenteed fitment. If the kit fits like crap, you'll have to like with it. With fiberglass, you can mold it, so if the kit fits bad...the right amount of money and time can fix this. However, they are more brittle and easier to crack. Among fiberglass kits, Handlaid fiberglass kits are less brittle than chopper gun fiberglass kits. They are also less wavy and tend to fit better. Chopper gun kits cost less, but are more wavy and more brittle. There is NOTHING wrong with getting a Urethane kit over fiberglass. Urethane, CF, or Fiberglass....Kits have NO effect on racing, street, track, strip or auto-x.
Do some research and stop making fun of your friend. There is nothing wrong with beign new to a subject. You both need to take a step back and do some research...and PLEASE learn how to spell and structure a sentence better.
and STOP STREET RACING!!!