Reducing weight

For all we talk here about power, weight is a problem I've ran into before on cars. See, on the drag strip its easy: pull out everything you can without losing rigidity, and add a roll cage.

But for the street, its a little more difficult. It becomes the problem of "how do we keep the car legal and make it perform beyond stock specs?"

So keeping in mind that we are building a car that would meet all requirements to be street legal, what are some things you do to lighten the load in the car?  

all depends on what you have for a car,you could take out the heavy steel/plastic bumper fillers and make your own from lightweight aluminum,repace heavy factory wheels with lightweight aftermarket ones.every car is different,but all are the same,equiped with heavy factory junk.  

In a real streetcar, something you daily drive or at least put considerable miles on, I'd go with a set of lightweight racing seats, remove the rear seat (if it has one), then score some lightweight brakes and wheels. A fiberglass or carbon fiber hood wouldn't hurt either. If the car must pass emissions standards than really the only other thing you can do is remove the A/C if you don't mind the heat in the summer. I would leave the bumpers, glass and rest of the interior intact unless you want to risk serious injury in an accident or your hearing and/or sanity. Given the limited capacity to remove weight from a streetcar, I'd agree with the consensus in just turning up the wick.