Exhaust system for a 1965 Dodge Dart GT

The standard Y pipe for an early A body is around 1 7/8”. what I did is transitition off the end of the Y Pipe into 2 1/4” pipe to a Magnaflow muffler then continue 2 1/4” to the stock resonator. You can get a muffler shop to fab a Y pipe to 2” but probably no worth the expense given what results in performance.

I just checked the TTI site. You can get head pipes with the flanges that will bolt to your manifolds. Only drawback would be the cost

https://www.ttiexhaust.com/Classics-Ex/MfdCastingNos-340.pdf