try these guys:
Josh
Mandrel Exhaust Systems
info@mandrelexhaustsystems.com
www.mandrelexhaustsystems.com
They were willing to make an exhaust for a third generation maxima (89-94) with no crazy set up cost like you are talking about with Borla. I did not get one of these ^^ but a few guys on my fourm did and it sounds like they got a really good deal. I think the tubing kit was under $150, and it mandrel bent. Here is the full thread if you are interested in reading it. http://forums.maxima.org/3rd-generation-maxima-1989-1994/621607-whos-interested-3rd-gen-cattman-2-5-catback.html