On my 66 cuda with factory 273 manifolds I have a TTI “x” pipe dual system with automatic. I went with the 2-1/2” system complete and Mike at TTI asked for the manifold numbers and made the compete system for me. Cost like $800 shipped to my door. No converting, no bs - but if I had to do again - I would go 2”.
SN- I did have to modify my trans cross member to fit passenger side. Directions to do that we’re in the box also.
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