What is the best turbocharger for an Audi A1?

I'm trying to upgrade my Audi A1 and want to add a turbocharger. Which brand or model would be the most efficient and suitable for my car?

The best turbocharger for your Audi A1 would be the Garrett GTI Series. It has been tested and proven to provide the highest performance and reliability for your car. My recommendation is to go for the GTI3071R model, which is specifically designed for smaller engines like the A1. It will provide a significant increase in power and torque, while also being more fuel-efficient.

I have been using a BorgWarner EFR Series turbocharger on my Audi A1 for the past year and I am extremely satisfied with its performance. It has a responsive boost and provides smooth power delivery. The EFR6258 model would be a great fit for your A1, but make sure to also upgrade your fuel injectors and exhaust for optimal results.