Upgrade parts for your BMW 4 Series GC
We can help you choose parts that suit your engine, your power target and how you use the car.
Water / Methanol Injection
Help reduce intake temperatures and engine knock on suitable performance builds.
Explore upgrade
Nitrous Oxide (NOS) Injection
Add power when activated, with the right fuel supply, controls and engine setup.
Explore upgrade
Exhaust Systems
Explore Milltek and other leading exhaust brands, with fitting at Llandow Tuning.
Explore upgrade
Intercooler Upgrades
Keep intake temperatures down and help maintain power during hard driving.
Explore upgrade
Turbo Upgrades
Increase power with a suitable turbo, supporting upgrades and custom tuning.
Explore upgrade
Before you buy parts
Tell us what is already fitted and how much power you are aiming for. We can advise on suitable parts, fitting and tuning.
Selected: BMW 4 Series GC G26 · M440d xDrive M440d xDrive B57D30 335HP Diesel