I am about to sell my old stock exhaust system. From what I understand, the stock exhaust of an ss s/c is 2.5" to 2.25"

So that means that the inside diameter of the pipe is 2.5", or is that outside diameter being2.5"?

Also, how much do you think the catback systems weighs? I still have the stock header and downpipe attatched to my car, so it is just the resonator and muffler section. I am just wondering so I can get an acurate quote of how much it will cost to mail the package.

Any help would be huge! Thanks!