This is an Elise, not Evora, sorry wrong group, but it was the only P0106 discussion.
Yes, I'm aware of the code pull. The option was to replace the ECU, if it was indeed a bad internal pressure sensor. Sometimes this can be due to an ECU breather clog. Luckily this exhaust fix sorted it... somehow.
Computers can get confused I suppose, especially paired with the initial P0420 and then subsequent P0139 (the O2 simulator doesn't work with electric-control throttle in 2006+), in tandem with the exhaust leak causing rich condition.
Another note, on my lotus, the Vacuum Switching Valve was hanging, loose, wires taut against intake tube. It may be related, but doesn't seem to be, considering I left the electric unplugged and no code after a session of hard driving. Perhaps having the vent smack around under the car could have caused a computer-confused condition.
Nevertheless, the exhaust repair, so far at least, has resolved the code.