200R4 update
I don't need 3" with my horsepower. I would have better top end, but lower torque. This motor is about torque. Plus, the 3" wouldn't clear my crossmember unless I bought oval exhaust. It's kind of the same reason I used 1 3/4 - 1 5/8 step headers instead of the 1 7/8. I didn't want to give up the torque.