Bill, I have the mufflers you are asking about on my 68 Hemi Road Runner. The 2.5" in/out Dynomax's. You are welcome to come up to the Phoenix area and we can go for a ride if you want?? Chris
Chris the 2.5 in out is the 17748 , Bill was asking about the 17747 with is 2.5 in , 2,.25 out.
