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.
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Nitrous Oxide (NOS) Injection
Add power when activated, with the right fuel supply, controls and engine setup.
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Exhaust Systems
Explore Milltek and other leading exhaust brands, with fitting at Llandow Tuning.
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Intercooler Upgrades
Keep intake temperatures down and help maintain power during hard driving.
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Turbo Upgrades
Increase power with a suitable turbo, supporting upgrades and custom tuning.
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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 F36 · 418d 136HP Diesel