www.partznet.com has a turbo catalytic converter listed for $285.58. Thats what you'd pay for an aftermarket downpipe, so i don't think it's TOO bad of a price. It's $80 less than going to the dealership though
I havent looked at a MR2 exhaust yet. Do they sell a piece that go straight from te turbo to the muffler (with teh cat in there) or is it sections that i have to buy. Man i am so lazy, i need to start checking the car out.