Finally made my mind up on engine, emissions?

[aerosam]

I'm pretty sure the testers are wise to such moves as having a V5 altered, they would know that a sierra never had a zetec fitted by the factory.

What't the big issue with fitting a cat? If you are going to the expense of using bike carbs etc, then why not fit the engine with it's original injection system and cat for IVA then switch to bike carbs later?

If it's the looks your worried about then 7tips do a nice silencer with a cat built inside it.