Pro's: lots of air and good filtration
cons: louder, expecially with a Jack brake, and at least with my set up increased turbo bark
I need to be real carefull in the upper settings of my TST untill I get my twins. I just run on level 3 or 4 because of the turbo surge. Most of my problems stem from too much fuel, but the filter doen't help. In a stock set up you might not see inceased bark.
Aaron