Hello , i also have a T230.

Been advised that they are supposed to run rich so pistons dont melt (unless you have forged bottom end then i wouldnt know).

I believe they have been mapped to run a cat if you wish untill then you have to find a 'friendly' MOT tester.

more advice and t230 friendlyness

https://www.facebook.com/pages/GMD-F...88363341184171

and also

https://www.facebook.com/pages/Ford-...25413097473708

good luck!

any pics?