maybe because i'm bias, but I like the maxspeed exhaust. definitely louder, even at idle. there is a slight resonance when cruising but nothing too annoying. When paired to an EVO cold air intake (like I have) it's awesome. I love the sound when the intake kicks in around 3000 rpms
a good source is youtube. just search for boxster exhaust and there are many videos to give you an idea of what each sounds like, including the maxspeed exhaust