BMW F93 M8 Gran Coupe — Best Aftermarket Upgrades

The BMW F93 M8 Gran Coupe occupies a unique position in BMW's M car lineup — the most practical and most versatile M8 variant, combining the S63 V8's 600bhp performance with four doors, a sloping fastback roofline, and a level of everyday usability that the two-door F92 coupe and F91 convertible cannot match. It is a car that does everything — genuinely fast, genuinely luxurious, genuinely practical — without obvious compromise in any direction.

The Gran Coupe body style gives the F93 a visual character that is distinct from the F92 coupe — longer, more elegant, and with a fastback roofline that creates a silhouette closer to a shooting brake than a conventional four-door saloon. This visual identity creates specific opportunities for aftermarket upgrades that suit the F93's character particularly well — upgrades that enhance its grand tourer presence without converting it into something it was never designed to be.

This guide covers the best aftermarket upgrades available for the BMW F93 M8 Gran Coupe.

Understanding the F93 M8 Gran Coupe

The F93 M8 Gran Coupe shares its S63 V8 engine, M xDrive drivetrain, and most mechanical architecture with the F92 coupe and F91 convertible. The primary differences are the body structure — four doors, a longer wheelbase, and the fastback roofline — and the associated changes to rear body geometry that the different body style creates.

These body structure differences are significant for aftermarket buyers. The F93's longer body, different door apertures, different C and D pillar geometry, and revised rear bumper and boot lid design mean that exterior parts developed for the F92 coupe will not fit the F93 Gran Coupe correctly. Always verify F93-specific fitment when ordering exterior components — generic M8 listings that don't specify body style should be avoided.

The F93 shares its front bumper geometry with the F92 coupe — meaning front splitter options developed specifically for the M8 platform will typically fit both body styles correctly at the front end. The rear bumper, boot lid, and rear quarter panel geometry are unique to the Gran Coupe and require F93-specific parts.

Carbon Fiber Front Splitter

The F93 M8 Gran Coupe's front end is shared with the F92 coupe — the same wide lower intake, the same prominent M-specific bumper, and the same imposing frontal presence that defines the M8 range. A carbon fiber front splitter addition transforms this front end with the same visual impact as on the coupe — extending the lower bumper line, adding visual mass, and creating a more planted, aggressive front end appearance.

The F93's longer wheelbase and four-door body mean the front splitter sits in slightly different visual context than on the shorter F92 — the longer car's proportions make the front end look slightly less prominent relative to the overall body length, which means a front splitter's visual contribution is proportionally important for maintaining the aggressive character the M8's performance justifies.

For F93 owners building toward a more complete front aero package, canards mounted at the outer edges of the front splitter add downforce and visual drama that references the M8 GTE racing car's front aero specification — a factory development connection that gives this upgrade direction genuine credibility on the road-going M8.

Exhaust Upgrades

The S63 V8 in the F93 M8 Gran Coupe shares its exhaust architecture with the F92 coupe and F90 M5 — the same twin-turbocharged V8 with the same factory noise regulation restrictions that prevent its full acoustic potential from being heard in standard form.

A valved cat-back exhaust system is the most impactful and most appropriate exhaust upgrade for the F93 — in closed mode maintaining the refinement that the Gran Coupe's grand tourer character demands, in open mode revealing the deep, authoritative V8 character that the factory system prevents. The contrast between the F93's elegant four-door fastback appearance and the S63's full acoustic presence in open mode is one of the most entertaining aspects of this car's character — understated in appearance, extraordinary in sound when provoked.

The F93's longer exhaust path — from the front-mounted V8 back through the car's longer wheelbase to the rear outlets — creates installation considerations that are even more pronounced than on the shorter F92. Professional installation by a specialist with F93-specific experience is essential for any exhaust modification on the Gran Coupe.

High-flow sports cat downpipes for the S63 deliver the same power gains on the F93 as on all S63-powered BMW M cars — 80–100bhp over standard on a comprehensive tune with supporting modifications. For F93 owners who want a car whose performance matches its modified appearance, downpipes and a quality ECU remap are the most impactful single investment available.

Carbon Fiber Rear Diffuser and Spoiler

The F93 M8 Gran Coupe's rear end is defined by its fastback roofline — the sloping rear glass flowing into a short boot section creates a silhouette that is more elegant and more distinctive than the F92 coupe's more conventional three-box profile. Carbon fiber aero additions at the rear of the F93 need to respect and complement this elegant fastback character.

A carbon fiber rear diffuser replacement transforms the F93's lower rear bumper section significantly. The M8's quad exhaust arrangement creates a natural visual focal point that carbon diffuser designs exploit — the combination of exposed carbon weave and the quad exhaust symmetry creates a rear end treatment that looks properly purposeful. The F93's rear bumper geometry differs from the F92 — always verify F93-specific fitment for rear diffuser components.

The F93 Gran Coupe's fastback roofline creates a specific opportunity for a rear spoiler that doesn't exist on the more conventional F92. A carbon fiber lip spoiler at the trailing edge of the boot lid — following the fastback's natural rake angle — is one of the most harmonious and visually effective single upgrades available for the F93. The spoiler sits naturally within the car's design language rather than as an imposed addition, completing the fastback profile and adding aerodynamic function that improves high-speed stability without conflicting with the Gran Coupe's elegant character.

For owners building a more aggressive visual direction, a more prominent blade spoiler on carbon end plates makes a bolder statement while respecting the F93's four-door practicality — creating a performance-oriented rear profile that references the M8 Competition's more aggressive factory specification.

Carbon Fiber Side Skirts

The F93 M8 Gran Coupe's longer wheelbase creates an extensive flank that responds well to carbon fiber side skirt extensions. The Gran Coupe's longer body gives side skirts a larger surface area to work with than the F92 coupe — the visual lowering effect of well-designed carbon skirts on the F93 is proportionally pronounced given the car's considerable length.

Carbon side skirts that follow the factory M Sport sill line precisely connect the front and rear aero elements cohesively across the F93's longer body — creating a complete lower body visual package that transforms the Gran Coupe's profile from elegant grand tourer to something with a considerably more purposeful, performance-oriented character. The F93's four-door body means the side skirt runs uninterrupted for a longer section than on the two-door F92 — creating a cleaner, more dramatic visual line that suits the Gran Coupe's proportions particularly well.

Suspension Upgrades

The F93 M8 Gran Coupe's factory suspension is calibrated for a car that serves as both a performance machine and a luxury everyday vehicle — the balance between sporting character and daily comfort is carefully managed in the factory setup to reflect the Gran Coupe's more practical brief compared to the coupe.

For road-focused F93 owners, quality lowering springs offering a 15–20mm drop improve the visual stance significantly and reduce body roll without compromising the Gran Coupe's everyday comfort. The F93's longer wheelbase means the arch gap reduction from lowering is visible over a longer body surface than on the F92 — the visual improvement from a correctly executed drop is particularly pronounced on the Gran Coupe's extended proportions.

Coilover options for the F93 M8 Gran Coupe are available from specialist manufacturers with F93-specific development programs. The Gran Coupe's longer wheelbase and different weight distribution compared to the F92 create suspension requirements that differ from the coupe — spring rates and damper tuning developed specifically for the F93's architecture are essential rather than adapted from shorter M8 variants.

Geometry setup after any suspension modification is as important on the F93 as on any other M car — the S63's rear-biased power delivery means rear geometry in particular affects the car's handling character significantly. A specialist geometry setup with F93-specific knowledge extracts the full potential of the Gran Coupe's chassis while maintaining the stability that a four-door grand tourer with 600bhp demands.

Wheel Upgrades

The F93 M8 Gran Coupe uses the same staggered wheel fitment as the F92 — wider rear wheels than front — and the same 5x112 bolt pattern that gives access to BMW's extensive aftermarket wheel ecosystem. The Gran Coupe's longer wheelbase and four-door body create slightly different visual proportions than the coupe — wheel selection that works perfectly on the F92 may look slightly different on the longer F93, and the optimal wheel choice for the Gran Coupe's proportions may differ from the coupe's.

For F93 owners targeting a more aggressive stance, a wider wheel and tyre combination that fills the Gran Coupe's arches more completely creates a visual transformation that is particularly effective on the longer body — the combination of a lowered ride height and correctly sized wheels fills the F93's proportions in a way that makes the car look significantly more planted and purposeful than the standard fitment achieves.

Carbon Fiber Mirror Caps and Interior Trim

The F93 M8 Gran Coupe Competition comes with carbon fiber mirror caps as standard — standard Gran Coupe owners and those wanting to extend the carbon theme further will find the mirror cap upgrade among the most immediately satisfying modifications available. On the F93's longer, more prominent body the mirror caps are proportionally visible elements — the carbon upgrade reads clearly and immediately on a car of this size and visual sophistication.

Carbon fiber interior trim for the F93 extends the factory carbon content and creates a more comprehensively carbon-trimmed environment that suits the Gran Coupe's performance specification alongside its luxury and practicality credentials. For a car used daily by owners who spend significant time in it the quality of the interior environment matters as much as the exterior modifications — a carbon interior package on the F93 creates a cabin that feels genuinely special regardless of journey length.

The F93 vs F92 — Which M8 to Build?

The choice between building an F93 Gran Coupe or an F92 coupe is primarily a lifestyle decision rather than a performance one — the mechanical specification is essentially identical between the two.

The F92 coupe is the purer performance car — shorter, lighter in the body structure, and with the more dramatic two-door visual impact that coupes always offer. For owners who want the most focused M8 driving experience and for whom practicality is a secondary consideration, the coupe's more immediate visual drama and slightly more focused character make it the stronger choice.

The F93 Gran Coupe is the more versatile and more practical M8 — its four doors make it genuinely useable as a daily driver for families and owners who regularly carry passengers, and its fastback roofline creates a visual identity that is more distinctive and arguably more elegant than the coupe's more conventional profile. For owners who want M8 performance in a car that serves every purpose without compromise, the Gran Coupe is the logical choice.

Both respond to the same S63 performance upgrades with identical results. Both look extraordinary with a comprehensive carbon aero package. And both deserve to be built with the same care and attention to detail that the M8 name demands.

At Velocity Performance Parts all BMW F93 M8 Gran Coupe parts are verified for F93-specific fitment and backed by our fitment guarantee. Browse the full BMW F93 M8 Gran Coupe collection and build your Gran Coupe with confidence.