Hey fellas, I'm at the stage of piecing together my exhaust (FD 13BT, T04z etc) and am confused about which cat convertor to go with. I will be using a 3.5in system and obviously want the one with the least restriction possible. There's a lot of conflicting info online...what are you people using and/or recommend? I always thought the Magic Cat was the gun choice, but a few people are saying ...