ok i've tried flowmaster and IMCO and loved them both. I have decided to go ahead and try magnaflow as well but stumbled upon some questions. I am going to take out all 4 cats and replace them with 2 magnalfow hi-flow cats but dont know what to do next. i am wanting dual magnaflow mufflers with and X or H pipe. i am also considering one muffler, either DIDO or SIDO and replacing the Y pipe. i like loud exhaust is the reason im considers the dual mufflers. any suggestions??? which would yield the best power gains while keeping it pretty loud??? how loud is the 11" magnaflow?

 

any suggestions???