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My Expy has a 2 7/8 in.outside dia. at the tip ( if I remember right) but I think the pipe is smaller at the muffler. I had a Flowmaster (70 series) installed that was 2.5 in.outside dia and it fit perfect.
What's the difference between the Flow 50 or 70? I had flows on my F150 but don't know which ones. I did like them. I want to trick out the 2003 Expy but not sure what to do.
The 70 series has slightly less of interior and exterior tone levels (within the mellow range) than the 50 series. The 50 series has a more of a deep tone level in the exterior side.
I chooce the 70 series because I didn't want the sound to resonate through the cab and not be able to carry a normal conversation. (Did not want my wife to complain about being too loud in the cab.)