M5 (G90 & G99) Parts & Modifications

Most owners start with a valved exhaust to bring out more of the V8, lowering springs to reduce the arch gap, and carbon styling such as a front splitter, side skirts and diffuser. Paddle shifters and interior trim are quick, reversible upgrades. Software tuning is still developing on the S68, so many owners prioritise sound, stance and styling first while tuning options mature.

Yes, but it is more involved than older M cars. The S68 uses a Bosch MG1 DME that requires a specialist bench unlock before it can be accessed, and the hybrid drive adds more systems for a tuner to manage. Calibrations are available from established tuners, but check exactly what is supported for your model year and body style, and whether any gearbox or hybrid functions are affected.

Lowering springs and height-adjustable spring kits from brands such as KW, H&R and AST are designed to work with the factory adaptive dampers, which continue to adjust in each drive mode. Given the car's weight, choose a reputable kit with matched spring rates, and have a full alignment after fitting. Check whether a kit is listed for the Saloon, the Touring or both, as the rear spring rates can differ.

Engine, gearbox, brake and many front-end parts are shared, so items such as front splitters, downpipes and some exhaust sections may fit both. Rear bodywork, diffusers, spoilers, exhaust rear sections and rear springs are often body-specific. At R44 each product lists its fitment, and saving your M5 to My Garage filters the catalogue to the correct body style.

Generally yes. Sports-cat downpipes change exhaust flow and sensor readings, so they are designed to be paired with matching engine software that is calibrated for them. Running them without a suitable map can cause warning lights or poor running. Declare the change to your insurer and make sure the car still meets UK MOT requirements.

In the UK, fitting aftermarket parts does not automatically void the whole warranty, but BMW can decline claims for faults it links to a modification. Bolt-on styling and suspension parts are lower risk than engine software, which is detectable and can affect powertrain and hybrid system cover. Keep original parts, use professional fitting, and declare all modifications to your insurer.