What is the best way to increase horsepower in a Ford Transit Custom?

I recently purchased a Ford Transit Custom and I'm looking to increase its horsepower for better performance. What are some reliable methods and products I can use to achieve this?

Adding a cold air intake and performance exhaust can help increase horsepower by allowing for better air flow in and out of the engine. You can also consider installing a performance chip to optimize your engine's performance.

Upgrading your Ford Transit Custom's fuel injectors can also have a significant impact on horsepower. Look for high flow injectors from reputable brands for the best results.