Go to any muffler shop that has a lift or drive over and they can replace with a standard muffler. I did this this year and cost was $98. Inlet is 2 1/2" and outlet is 2 1/2" straight thru but the offset muffler, middle inlet and side outlet, worked great.
There are only side jacking points for the Rialta and no subframe. Read your manual for lifting points for the R to change a flat.
Wipper stwitch may be your problem. Try spraying WD40 in wipper arm, steeribng wheel area, and move back and forth. If the switches, all on the steering wheel, are not used much they will corrode and not work. This problem has occured with high beams not working because lack of use.