need some help on exhaust for 92 integra LS 4 door 5 speed

HI, i am new to these lists. i have been a long time BMW fan, but my sister is deciding whether to keep or sell her 1992 Acura Integra, 4 door, 5 speed LS sedan.
i drove it for the past week, and it is a tight, quick, sweet little ride.
she has 123K on the odo, and i just did the Maryland inspection and everything passed except the muffler. she has a LIFETIME midas muffler (BIG JOKE!) but when i took it in. they wanted 222 bucks for the exhaust pipe BEFORE and after the muffler plus labor..thus 222 bucks for a job that i thought was under warranty..
AND her catalytic converter just wore out. the car smells like rotten eggs when you start up the car.
i am her disabled brother and i can get a waiver for emissions test in MD, IF i buy it and drive it less than 5 k a year.
My questions are ..Can you drive one of these cars without a catalytic converter? will it hurt the car?
can you purchase a different exhaust or pipe to compensate?
does anyone know anything about bosal cats? i saw one online for 142 bucks plus installation. and i can get a midas muffler and brackets and gaskets under the warranty. i would just need some advice on an honest mechanic/shop in the montgomery county, Maryland area (just northwest of DC..recently called "SNIPER" country)
any advice would be appreciated.
IF i help her sell it, does anyone know the going price on a clean, one owner, 1992 Integra 5 speed, LS, 4 door sedan, with ALL service records. oil and filter every 4k since new. all services on time.
THANKS!
TMH