custom is the way to go, besides going TRD
here's my list of what to do:
1. find a nice muffler - IMO, get a Carbon Fiber wrapped muffler preferrebly RACtive or Stinger.
2. find a shop to do the work. get a few qoutes on who can do it cheaper.
3. ask if they do mandrel bends for a clean setup/freer flow.
4. straight-pipe that bitch. choose whether you want it from the axle-back or from the cat-back.
this will save you around $250 compared with buying the TRD
, TPR, KAZUMA, TSRM...etc...