I am back on forum

[Numplumb]

Hi I have an engine which has a number but that's no good for Mazda to supply a letter confirming the year of manufacture they need a vin number.
IVA need the letter of proof from Mazda for emissions test without a cat otherwise they class it as a new engine and it won't pass.

[Numplumb]

I have been reading up about mk1 mx5's it seems they had a cat fitted, and they sell them on eBay 350mm long for approx £60 but they are not type approved and are illegal on cars after 2001 apparently.
My ecu is a B64F which is not OBD2, so I'm wondering whether if I fitted one to my car I would be able to get it through without a letter from Mazda.
Anybody got any thoughts on that.

[Ianr]

That sounds like a plan - I'm not a mega techno but a cat seems to sort most of the issues. I bought a cheap weld in Cat from ebay which got my Mk 2 engine through with no problems, basically - any cat should do it although you can get 100, 200 and 400 cell types. The higher the number the higher the resistance but greater cleaning effect, mine was a 400 cell as I didn't want to fail IVA and does not seem to have much detrimental effect. And it only cost about £50

I take the point about you have an engine but maybe a replacement with a provable history would get you through IVA was my earlier point