85 Turbo Coupe OEM exhaust size?

Anyone know what size the exhaust pipe is at the muffler on an 85 Turbo Coupe?

the pipe from the cat to the muffler,
and the 'tailpipe' (from muffler over-axle to chrome tip) are both 2" O.D.

(which means the I.D. of the 'over-axle' crimp-bend is about 1.5')

my 86 XR7 picked up a bunch of power when I went 2.5" (crimp-bent) from the turbo down-pipe all the way back ..