I agree with slash,

try not to build a car on credit!! it will come back to bite you in the ass. take your time, save up, buy each piece when you have the $$. you'll be better off in the long run.

besides...if all your friends:

jumped off a bridge
stepped in front of a bus
killed themselves

would that make it ok for you to do the same? jsut becasue your friends are doign it doesnt mean it is the prudent way to do things.