[riverat1540]

u also need to know if the 2.5 is the inner diameter of the pipe or the outer diameter. if they are the same u can just connect them with band clamps but if the pipe on ur truck will fit over the glass pack that is the way to go and u can get a better fit less likely to leak, also if the old muffler is off set u will have problems with the fit. before u go cutting up ur old stuff besure u have a strait shot between the pipes after u cut the muffler out.