BMW 8 G14 Parts

When BMW brought back the 8 Series nameplate in 2018, a lot of us were skeptical. The original E31 is a legend, and anything carrying that badge has serious shoes to fill. But after spending real time with the G14 convertible, it's hard not to respect what BMW pulled off here. This isn't just a styled-up 6 Series with a new number - the G14 rides on a platform shared with the 7 Series and Rolls-Royce Ghost, uses carbon fiber reinforcement throughout the body structure, and pairs genuine grand touring comfort with chassis dynamics that will genuinely surprise you on a back road. For the US market specifically, the cabrio version hits a sweet spot that nothing else in the BMW lineup quite covers. You get open-air cruising with a trunk, proper rear seats (tight, but there), and enough powertrain underneath to make it more than a show car.

The G14 launched stateside in the 840i guise running the B58 turbocharged inline-six - a motor the tuning community has embraced almost as warmly as the old N54. It makes 335 horsepower stock and responds beautifully to basic bolt-ons. The M850i xDrive is the one most of you are probably here for, though. That S58-adjacent twin-turbo 4.4-liter V8 - the N63 family updated as the S63 in this application - pushes 523 horsepower from the factory and sits in a platform rigid enough to actually use it. For the serious crowd, BMW North America also brought over the M8 Competition Convertible, which is a different conversation entirely: 617 horsepower, carbon ceramic brake availability, M compound differential, and a curb weight that'll humble you on a dyno sheet but shock you on a dragstrip. All three engines have real tuning headroom, and the aftermarket has been catching up fast.

Let's be honest about where these cars need attention before you start chasing power. The G14's biggest real-world complaint - especially on the M850i - is heat management. The N63/S63 engine family has a well-documented history of heat soak affecting both performance and long-term reliability, and the G14's tighter engine bay doesn't help. If you're putting miles on this car in anything warmer than the Pacific Northwest, an upgraded intercooler should be one of your first calls. Brands like Burger Motorsports (BMS) and Eventuri have done solid work developing thermal management solutions for this platform. While you're under the hood, the stock air intake on the B58 and S63 variants leaves measurable power on the table - a quality intake from Engine upgrades is low-hanging fruit that pairs well with a tune.

On the suspension side, the G14 runs adaptive dampers stock (Variable Damper Control on most trims, full M suspension on the M8), and they're genuinely competent. But if you're lowering the car - even just for stance on a daily - you need to be thoughtful. This chassis responds well to quality coilovers from KW or H&R, but cheap spring drops on the factory dampers will punish ride quality and accelerate bushing wear. Check out our full Suspension catalog for fitment-confirmed options. Wheel fitment is another area where the G14 rewards patience. The wide rear haunches give you real room to work with, but the staggered factory setup means you'll want to pay attention to offset specs carefully - head over to Wheels & Tires before you order anything.

Brakes are often overlooked on a GT car, but if you're tracking the M8 or even spirited canyon running with the M850i, the factory setup fades faster than the power delivery suggests it should. Upgraded pads from Hawk or EBC are the affordable first move. Big brake kits from StopTech and Brembo are available if you want to get serious about it.

Most G14 owners are building a refined, fast daily - and that's completely legitimate. For that crowd, the priority order looks like this: tune first (Bootmod3 or MHD on the B58, JB4 or a full flash on the S63), then intake and Exhaust for sound and a few extra horses, then suspension for driver confidence. A properly tuned and exhausted M850i with a modest drop and a set of staggered 20s is one of the best-looking, best-driving GT cars on any American highway right now. For Body & Aero work, the M Sport package adds visual aggression, but the aftermarket offers carbon fiber splitters, diffusers, and mirror caps that genuinely sharpen the G14's already dramatic lines without going over the top.

The track crowd is smaller but growing, especially around the M8 Competition. Here the sequence shifts - suspension and brakes come before power, always. Getting the weight balanced and the chassis communicating clearly matters more than another 40 horsepower when you're trying to improve lap times. Expect to invest in proper alignment after any suspension work; the G14's geometry is sensitive and the factory settings leave toe adjustability on the table. This platform rewards methodical builds over impulse buys, but when it comes together, a sorted G14 is a genuinely special machine - and one that still turns heads in any parking lot at any event on the calendar.