Hey Cobra welcome to the forum. I have a 99 as well. I put a magnaflow turbo back exhaust on mine which sounds tremendously awesome with just a muffler only. I have a friend with an 01 that is straight piped and it sounds really good too. I had mine straight piped as well for a while, but it was just cut off right under the cab and had a turndown on it. It got pretty noisy and annoying when the sound bounced all around underneath. I'll run it straight again since it's now exiting behind the tire out towards open air as soon as I find a place around here that can flare a piece of 4" for me. I live in Indiana and we don't have those inspections some of you guys worry about with having removed cats.