Just went to
www.nopi.com and found this for price on a 94 civic dx cat back exhaust
001+2558 APEX I World Sports Series Exhaust - DX; EX/Si 2dr - SUS 304 Stainless Steel - Pipe Size: 60.5mm - Tip: 100mm $422.01
I know they make an axle back but the quality of the piping from the cat back is excellent. Probably the last muffler you will ever put on that car.
Maybe get it for cheaper elsewhere but that was the first place I looked.