check out places like, modacar.com, alljdm.com, jcw.com, summit.com, and so on. Personally for the CRX, 4th gen civic I love the Apex world sport exaust, RS*R exaust are always dope, HKS sport exaust looks dope on a CRX, as it has to exit pipes like the stock one, Thermal makes a bitchin' product, and the Greddy MX is a good CRX exaust, there are many more options, those are just some really nice sounding mid to high end exaust systems, that are functional as well as good looking. My vote is for the RS*R exaust, just because I just purchased one, and I love how it looked, sounded, and mostly performed on my buddies 4th gen hatch.