6 replies to this topic

[andyapanel]

Ive just bought a 1990 Cooper with a Catalyst and the original manifold.

Ime thinking of replacing with an RC40 type stage 1 kit. Has anyone had MOT emissions problems having done this?

[Bungle]

no problem with a MOT

 

and the exhaust , manifold and air filter have been fitted for about 18 years so have passed many

[mk1leg]

well what you need is a new exhaust that has the facility to have the cat but you can buy a link pipt so when it comes time to have the mot just remove the link pipe a cople days before and run cat get tested and then refit link pipe........thats what most folks do......

[andyapanel]

Ive considered that option, mk1, but I can't believe its conducive to good gas flow...unless you know better? 

[Mrpeanut]

I have the same car.  It's cat free.  I have an RC40 twinbox with a cooper freeflow (not the usual lcb), a decent inlet, ramair filter (with turner carbs stub stack) and a slightly ported big valve head.  I get tremendous results with no emission issues.

[andyapanel]

That is the route I am thinking of, tho I think I will keep the single carb. Thanks for the advice.

[KernowCooper]

well what you need is a new exhaust that has the facility to have the cat but you can buy a link pipt so when it comes time to have the mot just remove the link pipe a cople days before and run cat get tested and then refit link pipe........thats what most folks do......

 

You wont need a cat on a 1990 Cooper for a MOT and the engine will perform better with a LCB and a RC40 system on.