a friend of mine has a TJ with the 4.0 with borla headers and a catback system, it sounds pretty sweet but i dont know what the header alone sounds like. Id go with borla
LIFT IT!.....fat chicks can't jump high. 99 Sahara.......3inch black diamond lift, quick discos, 32X11.50 BFG all terrains.
If you only have one tool, a hammer, you tend to see every problem as a nail.