Add to Cart The item has been added Racechip GTS Black Tuning Box with Bluetooth App BMW M5 G90 727bhp This product is for Racing Competition only and is not legal for use in highway or street vehicles or other non-racing competition off-road vehicles. Get your BMW M5 G90 engine tuned with the GTS Black tuning box kit from Racechip. The tuning box... $898.00 Add to Cart The item has been added Compare