Tuning on a PCP

Hello im new to the site and im 2 weeks away from picking up my new Audi S3! :) its on a PCP deal and ive heard that Revo do a stage 1 that ads up to 60bhp. Does anyone know if its possible to tune just to stage 1 whilst on a PCP or is tuning a no no? Any help would be great thanks :)
If you aren't worried about Audi flagging your car than tuning will yield the most hp.