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Hope all is well, sorry for the delay, I just recieved your message.
i would suggest either a set of plug wires by MSD (#32539) or if you want a cheaper set of performance wires that you can get frommost parts stores a set of ACCEL thundersport wires are also good wires. Be sure if you install these wires that you use a small amount of dielectrical grease on the points of the wires where they contact the plugs and the coils. THis is a part you can easily install yourself in about 2 minutes time.
A company called Magnaflow makes a decent catback system for this car but it will run you around $700 for this. I might would put this expense off for a while, especially with Saturn's announcement today of the company being shut down we need to see how redily available parts are going to be on the older models like this.