Here is the Supersprint exhaust downpipe kit for the 2018 BMW 850i x-Drive, equipped with the latest generation N63B Twin Turbo V8 engine.
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https://www.supersprint.com/ww-en/sport-exhaust-supersprint-bmw-g15-m850i-xdrive.aspx
Built with oversize diameter tubing, and a set of HJS Motorsport, 100 cpsi large-volume 130mm catalytics, this Supersprint exhaust system eliminates the overly restrictive, oem cats.
By freeing up this exhaust tract, getting rid of the only bottleneck in the entire system, the efficiency of the turbochargers improves by a massive amount, and the temperature in the engine exhaust port area gets considerably lower .
The performance increases hugely, remaining more constant under heavy use, while the emissions are kept under control at the same time.
It bolts up directly to the BMW Factory cat-back exhaust, which has a free-flowing, dual sound mode, ideal design already. No modification is required.
This Supersprint exhaust kit, which can be considered as the most cost-effective performance addition for this fine car, is available in a Racing, cat-deleting version as well.