76GMC1500

Well there is always the possibility that a wooden plug might get stuck in the EGR tubing between inspections. My question would be whether the cats have any muffler effect so as to permit cats only and no mufflers? It seems to me that cats and mufflers will cause a significant H.P. loss and since the '76 did not have cats originally I thought I would just use turbo mufflers. What about using only cats and no mufflers, too loud?

Don Shillady
Retired Scientist/teen rodder