well i have both the TRD
exhaust and a custom veilside one. theres a good and bad side to each. the TRD
is very quiet but has a great kick in mid range torque, but top end is kinda slow. the veilside has a custom 2.5 inpiping from the midpipe, it's very loud and provides a nice top end but low end has slowed a bit (not that noticable.) so i guess the only reason i have both is to switch of and o, because i like to have the veilside for autoX and the TRD
for street. i'd say go for it and have a custom one welded, you should look up apex'i N1 i hear good things about that.