What exhaust should i put on my 2000 jeep wrangler sport?

I have a 2000 jeep wrangler sport with a 4.0. I have put some money into the look and lift kit and some speakers. My buddy put on flow masters and gets better gas. It sounds ok i want something with a little deeper sound but only want to do a catback. Any ideas of who makes the best?|||flow amster 44 series of 40 series, i drive a 4.3l GMC jimmy and have a 44 series on her and she sounds like a beast. I suggest you do the same.