I used 2 inch for camed engine with twin su, was good. I used a straight through muffler but a offset one should flow well. Will drone on freeway
2 1/4 or 1/2 press bent will be ok as the bends typically restrict the flow by 1/4 inch in
Pipe diameter too. So 2 1/4 peas bend similar to 2 inch mandrel.
You won't need mega pressure as a series not renouned for torque