if you want twin pipes then maybe powerflow who does custom jobbies, check their main site and they have local
people in your area that do them but not all charge the same so ring round a few for quotes and haggle.
i only know of one importers of borla for the jeep -
http://www.usautomotive.co.uk/ and the price is pretty good.
i also have heard that borla is best for jeeps esp the gib engine ones.
there are alot of us companies that do exhaust systems for the jeeps and alot i dont really know about but alot
have been mentioned in us jeep forums.
if you dont want the hassle of importing [ thou not a problem ] best bet maybe powerflo.
hope that helps. ;)
p/s i am thinking of a borla too..........but i use my jeep to tow a horse !
not a good combination :'(