hey Rick,
I don't think there's much difference, between production and custom exhausts (performance improvments would be similar) price is in the same ball park as well, I guess it come down to having something a bit different I got mine done @ MADAZ in melbourne (nice guys, good work) I got the pipes, new air filter, PCIII and dyno'ed for less than termi pipes, I very happy with them.
![](http://farm4.static.flickr.com/3238/2713287042_ae156b3807_o.jpg)