There really isn't any instructions... they send a parts list and all the parts. Basically you unbolt the two spring bolts and 5 rubber hangers and slide out the old one. Since mine was in pieces I installed the spring bolt plate side first and used the rubber hanger to hold the end up. Then installed the muffler end and use the hangers and finger tightened the bolts then the muffler to the tail piece and went back tightened everything down. I am sure you can get the gaskets at PepBoys or Muffler shop cheap... couple $$$ each. Hope that helps.