if you're looking for a full exhaust the cheapest bolt on option is the pacesetter.....which sounds GOOD on the 3400 BUT it will rust out in a couple years. The next cheapest option is buy a muffler and go to an exhaust shop and have them put that on along with a custom exhaust. The most expensive option is the Borla (which i have on mine now)....stainless steel....sounds GOOD....not as loud as the pacesetter which is nice cause after a while it gets kind of old
Sounds like your just looking for a muffler....go with what sleepy said