The system seems to be similar, but not the same, as the Plus 4 SS system as fitted to my car. The distance from the engine to the catalytic converter is quite long and there were always problems getting the cat up to temperature and functioning correctly. With the original map I was always getting the engine warning light come on and MOT tests could have been a problem. In part this was resolved by fitting exhaust wrap but it was not really resolved until I fitted the throttle bodies and was able to fine tune the map. Not an option that you have with the GDI engine.

The other issue I had was that after 60,000 km the cat started to fail and I had exhaust smell coming into the cockpit. This was resolved by fitting a new larger diameter 300 cell cat. The sound was muted slightly, particularly at "around town" throttle levels, and the tone deepened a little. The cat manufacturer said that the size of the cat that Morgan had used they would normally recommend for no more than a 1600cc engine.

I suspect that other than the need to correct fuelling and emissions you will need the new flash to avoid constantly getting engine warning lights from the O2 sensor downstream of the cat.

Peter

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