The flowmaster FLO-15100 is the resonator. It's a dual 2" inlet and 2.5" outlet. The FLO-17111 is the 2.5" mandrel bent pipe from the resonator back to the y-pipe, 2 1/4" pipe to the mufflers which are 40 series 2 chambers. Deep tone at idle and it really screams when you get on it. I have it on my 92 and have no cats. I love it. It got deeper after about a month of driving due to soot coating in the pipes. I love it.
On a 94 you might have 3 or 4 cats, I'd delete 2 of them. If you have to keep the other two get high flows. Or remove them completely. DO NOT DELETE THE RESONATOR or your car will sound like a rice burner. I can't stress that enough. It will sound like crap. It will flow good but people will point and laugh when you go by.
I have about $600 into my exhaust. It was $270 for the flowmaster mufflers and pipe, $130 for the resonator, and $200 for catless downtubes custom made at a shop near me. Had to tell the guy the car was going to be a track only car and he didn't give me a receipt because it's illegal to remove the cats in many/all states.
Seriously when I pass someone at 10 psi in my 5-speed car first they hear the blower screaming and then the exhaust roar as I go by.
My friend had a big dog exhaust on his cougar with no resonator, it sounded pretty sweet at idle. I was driving next to him and he dropped a gear and took off. I was looking around for the buzzing/farting civic and then realized it was his car. HAHAHA.
Stock exhaust is 2".