I went in the other day to my local dealer and ordered a white bros. E-series pipe but they can't order it till tuesday so I can call in and change that if I decide on the Pro Circuit T-4. I haven't seen the T-4 so I can't really decide is the T-4 as tunable as the E-series? I want the loudest possible exhaust. The T-4 has a spark arrester right? Thanks for any replies!