Decat + Deres 200 cup help

[Lewis200cup]

Hello,

I am looking to decat and de-res my Clio 200, keeping the first cat which is in the manifold and just a straigh pipe to the standard back box, has anyone done this? Also does this bring any warning lights on or cause any running issues?? Thanks for your help

 

[bozothenutter]

Decat will bring an emissions light up...'doh
As I understand it removing the cat will increase the flatspot, so it'll need mapping that out.
Oh and you'll go deaf..

 

[Lewis200cup]

Decat will bring an emissions light up...'doh
As I understand it removing the cat will increase the flatspot, so it'll need mapping that out.
Oh and you'll go deaf..

So basically im better off just doing the centre box removal rather then that and a second de-cat? I have heard that a second de-cat will not cause the light to come on but I wanted to check with you guys on here.
Thanks