From what I know there’s only one way to delete the GPF which is by removing it. Don’t think it can be mapped out unless I’m wrong.
Best bang for your buck is a res delete without getting a totally new exhaust system. I’ve just took my res delete off my S3 as I’ve sold it and I couldn’t believe how quiet it was when it had been removed and the original resonator was put back on. Very muted pops and bangs and that is on the pre-GPF model so I can’t imagine how quiet the GPF models are. Plus you won’t void the warranty on the rest of your car unlike removing the GPF, which is also a MOT failure.
If you are interested in a res delete I’ve got an anti drone one up for sale in the classifieds.
cheers Bells. That makes sense. How did you get on with the MOT? I’ll have a look at your classifieds