And just to put some perspective on "The Big Four" in terms of real monetary cost... I spent the weekend at the CMP National crewing for a buddy of mine and his GP Limited Prep '87 Honda CRX. We had lots of conversations about the cost and effort on the car since GP is something I've considered doing.

The car is a very competitive limited prep car (on the pole for the race, under the existing GP track record). The car has custom molded front fenders, modified OE rear fenders, a houseman gearbox, and a trick Sunbelt motor with a custom cam (the Big 3 for limited prep). To this point (and there's still some things he can do to it) he estimates the car has nearly $25K in it. In comparison, had he stopped short of the Big Three and just built the thing as an ITB car his investment would have been around $13K.

Thats pretty much HALF... H A L F !
And thats Limited Prep. The suspension on the car is IT legal.

Again. THATS where you draw the line.

PS - Maybe we should make it "the big 5"
We forgot DOT tires. We definately want to keep that.