197 Removing Pre cat & Secondary cat

Hey Guys

Just joined the forum from South Africa - hope you all well.

Need some advice and info on experiences tried on this.

My car has been mapped and I want to remove the cat/s first before doing a full xorst, to see the difference. (no MOT laws in SA)

Would you recommend removing both cats or just the secondary cat?

What the pro’s / con’s with removing both or just the secondary cat?

Looking forward to the info