I see a lot of manual benders going for reasonable prices (< $1000), with the correct mandrels they would be suitable for rollcage/exhaust fabrication. There's even a few kits out there to help build your own. I'd like to have one of those -I'd be a bending fool.
Now, if you're looking for one of those hydraulic auto-benders, I've heard they sell for close to $20k.

Swordy, IIRC the flex coupler is within a couple of inches of a rear O2 sensor -if those values (left to right) are not the same, you'll have fueling issues. I wonder if there was clean (unburnt) air being drawn in through the leak, and the O2 sensor was catching it every now and again -this would indicate a lean condition at one of the four sensors. Not enough to throw a code possibly, but just enough to send your FMU into fits.
That's the only thing that I can think of.