I had to ask here because they dont have a bbs on my other car. What is the quality of universal mufflers? Are they junk? If they are any good, what would be better, a Apex N1, or a Weapon r or Tenzo R sytem? Is the Arospeed Bomb any good? I really want the bomb, but I'm curious about universal mufflers. My car is a 1998 mazda protege.