[zamp]

You can always look for the stock headers from a 91-92 sl2, they are reportedly as good as any aftermarket headers, and way cheaper if you can find them. They might not be compatable with the SC1 because they have different heads, but they are very similar engines and I would not be surprised if they fit.
also I totaly agree with forgeting about the dual exhaust, for a 4 cylinder car a 4 into 1 into 2 setup (which is what I am guessing you are going to do) doesn't have the advantages you normaly get from something like a dual exhaust camero with a 8 into 2 setup (this prevents interferince in the exhaust pulses), but it would be hard to fit a dual exhaust into a saturn. you don't need such a high flow exhaust, exhause systems are not about just getting the lowest backpressure, they are about getting the right amount of backpressure.

Also don't forget to lighten that thing as much as possible, removing weight helps everything, not only will it be faster, but it will handle better, break better, and your tires will last longer