This is what I'll probably use. The bottom inlet is 3inch which goes into 2.5 inch outlets above and on the opposite side. Should be good for the MR2 and with a good small pre-resonator..should really sound awesome.
On another note: Has anyone used a Berk or KO exhaust on a V6??? I wish people would post more sound clips of what they are running. Descriptions kinda suck when you are talking about exhaust.
Dave