1.8T – Experiences with turbo conversion wanted

Hello people! I would like to get a little bit of power out of the smallest 1.8t. 150kw should serve as a benchmark. therefore the little turbo out and another should follow. also I am looking for a bigger llk and at the end he gets a control unit adjustment on the roll. have a total of about 2k€ available my questions: 1. are these conversion measures sufficient for the desired performance? 2. which turbo should I take??? have you had experiences? 3. which charge air cooler is recommended? I have often been recommended the llk of the mercedes sprinter, but the place? 4. what do you recommend besides my ideas? think that I will expand the exhaust system to 70mm, but otherwise?