Have them on my 03 cab and love them. Only downside is increased fuel consumption from taking her to redline from every stoplight just to hear her roar! By the way, the guy from GHL told me that there really is no loud vs. regular for 02 and beyond.

 

Good information from everyone. Thank You. I'm heading down to have them installed in about 30 minutes. I'm both excited and apprehensive. As someone pointed out, worse case scenario is I pull them off and put the stock ones back on.

 

GHL regular on my 00 cab. No resonance. Delightful sound. I haven't turned on the radio/CD player since I put them on last winter!
Just one thing: don't get the tips. They look good from the back (i.e., facing the back of the car) but they are too short on the side (i.e., you can see the tailpipe coming down).

 

have had the regular on my 03 c2 for a year and a half. I love it. no resonance for me. I guess I made the right choice by not going with the loud.

 

There is actually, just ask Brian. My louds clearly had 'loud' written on them in fact, they were significantly lighter than my previous ghl regs and much louder.