I want to get rid of my 5Zigen Fireball, it's too loud. I was looking at the Apexi WS, and it looked like something I would like. However, Im really stuck on numbers here, and I wondered if anyone has a 00' EX with it. Anyone feel a difference from it? I dont want to dyno again (i've dont it 4 times @55.00 a pop.) how much HP are we looking at loosing? Is the cat-back piping 2.25" or is it smaller? Thanks for the help!