Try www.tirerack.com for some ideas on lowering springs. Go to the customizing section and look at their suspension stuff. They sell an H&R 'OE' spring kit for my car, which lowers it .75/.50 inches but makes the ride only slightly stiffer. Look for that for the CL. Those cost about $175. Tires are generally going to make a bigger difference than springs, so pick yourself up a set of high quality summer tires like the Bridgestone Potenza S-03's. They'll run you about $600 a set.

Headers on your car will also gain about 20-30WHP, so you'd have Type-S horsepower for about the same money you would spend for the Type-S upgrade. www.comptechusa.com really has the best stuff. They sell a supercharger which adds about 60+ horsepower, so you might want to look into that. Since the transmission issue has been resolved in the 2003 model year, that might be a good investment for about $4500. They also have a REALLY nice exhaust that is pricey but is only slightly louder than stock, has a beautiful look to it, and will give you some good horsepower gains. Some Acura dealers stock and sell their parts.