liam14jets

Ok guys I have my 1992 Lexus Es300 and the muffler is rattling on the inside and the bolts are too rusted to take off so I am going to cut the pipe just before the bolts...
Since my piping is 2 1/4 and I am going to buy a glass pack muffler since its the only one I can afford and I like the tone of it whats size inlet/outlet muffler do I get do i get the 2 1/4 size and use a U Bolt Clamp or will i need a but clamp because I do not want to use a butt clamp since I have a ton of 2 1/4 clamps laying around from one of my old cars...
So anyway if the exhaust pipe is 2 1/4 and I want the muffler to slide over it to use a U Clamp what size muffler do I get??!?!?
Thanks guys lmk please especially if you have done it before lol