If you go to a 3in DP and use the stock elbow, most ones I have seen for sale are the 2 piece ones and they are hard to get leaks fixed.
If you can find a THDP, they are one piece and you do away with the elbow but you have to cut the cover to make it fit.
I have a high temp coated steel THDP on one car and a Mease SS on the other.
Though the SS DP will last longer, the coated steel pipe looks great.
Someone had a steel THDP for sale on the board and you could get it coated to go on your show car.