i have a 98 s.e v6 mtx and im keeping with th e sleeper look also. i went with a full 2.5 inch exhaust from the cat with a dynomax superturbo muffler. just to keep the sound low while at cruising speeds. i have pics on my car domain link below, along with other mod pics. i also plan to get a resonator for a smoother sound. plus i get a little rasp when the muffler is cold. my next mod is svt brakes. i have a optmized y for now later i might go with a bat with hi flow cat and gutted pre cats.