I went with one of those straight-through glass-pack type(3" pipe), and it definitely worked well enough. Quieted it down a bit on my '88 with Banks. It was... obnoxiously loud with nothing on it. Oddly enough, my '93 with factory turbo and full 2.5" exhaust(but no muffler)... doesn't sound bad at all. It's not obnoxiously loud. You can definitely hear it, and I might put a straight-through muffler on it before running it at 2500RPM for hours on end like I did this summer, but as long as you are only going 2200 or so, it's not annoying.