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Yup... have the same problem. Pulling the KOS 499 and dropping in my new 540 now. I would like to run 3 1/2 exhaust all the way as the Proparts headers have a 3 1/2 collector. Would be nice to find a 3 1/2 X pipe but may do an H crossover instead. Problem is that 540 also has 13.9-1 and too much cam (Indy R2) so still on C-16. I'll run it a while that way then drop in less cam and dished pistons.

Street car:




Bunch of places have 3.5" x pipes.

Pypes Perf, spin tech or get two 3.5" 90* bends and whip one up.