M340i (G20/G21) ENGINE & PERFORMANCE

R44 Performance lists 106 engine performance parts for the BMW M340i (G20/G21), including fuel system upgrades, intakes & air filters, ECU tuning & flash tools and intercoolers & charge coolers. Brands include MMX, Precision Raceworks, Genuine BMW, CSF, GSC Power Division, Motiv, and every part is listed for the M340i (G20/G21) – check each product page for body style and model-year fitment.

For most turbocharged cars, the best first upgrades are an ECU tune and an intake, followed by cooling upgrades such as a charge pipe and intercooler. Each supports the next, so decide on your goals first – our team can suggest a setup based on how you use your car.

Bolt-on parts like intakes can usually be fitted on their own, but bigger changes – such as downpipes, larger intercoolers, fuel system or turbo upgrades – normally need a matching ECU tune to run safely and make full use of the hardware. Check each product page or ask our team.

Modifications can affect manufacturer warranty cover and must be declared to your insurer. If your M340i (G20/G21) is still under warranty, check with the manufacturer or dealer first, and speak to your insurer before fitting.

Yes. Our technicians fit engine performance parts at R44 HQ in Wembley, London – contact our team for a quote and availability. We also deliver across the UK and worldwide if you'd rather use your own fitter.