I have a WS2 on my 4G, I've had it for several years now. I like the sound of mine, still. I have also heard good things abou the SP2 but never heard one on a Prelude. My buddy who autox with me has one on his B16 CRX and it sound nice when opened up. I have my WS2 with a test pipe and it's still quiet until I get on it. If I had another choice it would be the RS*R ExMag, not sure if they make one for the 5G but that may be something you want to look into.