BMW 8 G16 Parts

The BMW 8 Series Gran Coupé - chassis code G16 - is one of those Bimmers that doesn't get nearly enough love in the enthusiast community, and that's honestly a shame. Launched for the 2020 model year, the G16 took everything that made the two-door G15 coupe a head-turner and stretched it into a proper four-door grand tourer without sacrificing an ounce of visual drama. This isn't a 5 Series wearing a cocktail dress. The G16 sits on its own platform, carries its own attitude, and for those of us who need rear seats but refuse to give up on driving dynamics, it hits a very specific sweet spot that almost nothing else in the segment touches. Long-haul comfort, genuine performance hardware, and a silhouette that still draws stares in 2025 - the G16 checks boxes that most enthusiasts didn't even know they needed checked.

Stateside, the G16 came in three primary configurations that matter to the modding crowd. The 840i runs BMW's B58 inline-six - and if you've spent any time around the Supra community or the G20 M340i crowd, you already know this engine is a hidden gem. Torquey, smooth, and surprisingly responsive to tuning, the B58 is arguably the most mod-friendly BMW powerplant since the N54. Then there's the M850i xDrive, packing the S63-derived 4.4-liter twin-turbo V8 with 523 horsepower from the factory - a genuinely quick car that rewards bolt-ons and a proper tune. At the top sits the full-fat M8 Gran Coupé (F93 coding, shared platform), which is a different conversation entirely and gets its own treatment elsewhere on the site. For most G16 owners shopping aftermarket, the 840i and M850i are where the action is, and both have enough headroom to keep you busy for a long time.

No BMW is perfect, and the G16 has its quirks. On B58-equipped 840i cars, the stock intercooler becomes a limitation surprisingly early - especially in summer heat or after back-to-back pulls. If you're planning to tune, an upgraded engine FMIC should be on your list before you even touch the ECU. The stock downpipe on both the B58 and the N63 V8 is another low-hanging fruit; BMW's emissions-friendly packaging chokes flow significantly, and a quality catted or catless aftermarket unit makes a noticeable difference in power delivery and sound character. Weirdly enough, the stock exhaust on the M850i sounds better than you'd expect, but it still has room to grow - a mid-pipe or axle-back swap with active valve control is a popular first move for owners who want more presence without going full racer.

Suspension-wise, the G16 rides on adaptive dampers from the factory, which are competent but tuned firmly toward comfort on the softer settings and a bit wallowy when you push hard. The front control arm bushings - a recurring theme across G-chassis cars - deserve attention on higher-mileage examples. If you're daily-driving your G16 and want sharper turn-in without killing your spine on the interstate, a quality coilover setup or sport spring drop paired with stiffer rear sway bars is the move. Check out the full range on our Suspension page for fitment-confirmed options for the G16 platform. Wheel bearings on these cars are worth monitoring too; the G16 is not a lightweight machine, and spirited driving adds up over time.

Wheel fitment is another area where G16 owners can express some real personality. The stock 19s and 20s look proportional, but the arches on this car are begging for something wider. A staggered 20x9 / 20x10.5 setup is a popular street fitment that fills the arches without requiring aggressive camber or rubbing headaches. Head over to Wheels & Tires for a curated selection of confirmed-fitment options. On the aero side, the G16 has a surprisingly active aftermarket for a relatively young platform - front lip spoilers, side skirt extensions, and trunk lid spoilers from European touring-car inspired design houses have been filtering into the US market steadily. Browse the Body & Aero catalog for pieces that complement the G16's already aggressive factory lines without going full DTM.

Most G16 owners are building a refined daily driver with real performance teeth - and that's exactly what this platform does best. For that crowd, the priority list looks like this: ECU tune with upgraded intercooler and downpipe, a quality exhaust with valve control, sport springs or coilovers set conservatively, and a sticky all-season or summer tire on forged wheels. That combination transforms the car without making it a chore to live with. Trusted brands for this build include Burger Motorsports (BM3 tune), Eventuri for intake work, Dinan for those who prefer plug-and-play calibration, and Akrapovič or Eisenmann on the exhaust side.

For the handful of G16 owners who want to push further toward track use - autocross, canyon roads, occasional HPDE - the conversation shifts toward coilovers with proper damping adjustment, serious brake cooling solutions, and stickier rubber on lightweight wheels. The big-brake kit options from Brembo and AP Racing are available and make sense once you start carrying speed onto the street or exploring track days seriously. Whatever direction you're headed, the G16 rewards thoughtful builds over impulsive bolt-ons. This is a grand tourer with genuine performance DNA, and the aftermarket is finally catching up to what this platform deserves.