Flowmaster Muffler HELP and Exhaust question

Hi im new here and i have had my 2.2L 2000 Cavalier for about 3 months now. I want to start saving up money to upgrade it. I first want to start with an INTAKE and EXHAUST. I know what type of intake i want to get, but i just can't make a decision on what exhaust to get. There is an catback exhaust system at www.rksport.com either that or a flowmaster muffler. Im leaning toward the flowmaster muffler. My question is do you guys know which type of flowmaster muffler should i get or is at least compatible with my 2.2L 2000 Cavalier. I can't find one. I heard that the Flowmaster 60 works best with 4cyl and 6cyl but does that mean all 4cyl cars can have a flowmaster 60? Someone please help me!

unless you getting custom piping bent to go with the muffler, from the cat back, then get the rksport, it's a good system.

this is chevyfreak, I have the rksport single catback system and havent got to put it on yet....can you tell me if the sound and performace is good so i know what to expect.