So if I buy a decat pipe will the eml light come on and stay on ?

I have a petrol VRs mapped already ?

Pro s and cons with either please

Decat yes but then you can get a stage 2 remap which deletes the reason for the EML coming on it also adds a little power, torque and the exhaust helps the car breath better

Cons are you need a friendly MOT guy.

So if i decat and then switch that light of it will just come back on correct ? If i go for the more expensive sports cat the light wont come on ?

Correct. Grizzle is right.

Decat is a little noisier than sports cat too. But in a good way

So if i decat and then switch that light of it will just come back on correct ? If i go for the more expensive sports cat the light wont come on ?

yes without a map to delete the reason for the light it will come back even if you clear it with a diagnostic device.