For NC8, the Z28 headpipes were 2.25" in diameter EXCEPT where they attached to the exhaust manifolds. Again, that "Connection point" was 2" like the N10, and again, I don't know how far down it extended until it turned into 2.25". The short "over the axle" pipes were 2" after that first chambered section and then the tailpipes were also 2".
Anyone know if this was the same as the big block cars? I have a chambered exhaust 11C build car with 2" at the tips or should it be 2-1/4?