Keith at BHM is, as you know, very helpful. What you might not know is that he knows well Mark Adams, who worked on my Plus Four. It might be worth talking to both of them. Mark got an extra 30bhp at the wheels from my M16 : basically an Omex ecu and advanced ignition. The only induction change was an ITG filter. This was a development project and deliberately did not stress the engine. After six years I am still very pleased with it.
There is a wealth of information on TM about induction -one of the brilliant things about the site- but also interesting stuff under the heading of " interesting conversation regarding M16 engines" on the Rover Tech site.
Your exhaust installatiion looks the same as mine -very hard drilling into a ss pipe for the sensor! Regards, Meabh.
