Rear bumer air outtake grills Mansory Carbon for Ferrari 812 Superfast Stallone

Rear Bumper Air Outtake Grills Mansory Carbon for Ferrari 812 Superfast Stallone

The thermal load that the Ferrari 812 Superfast's naturally aspirated F140 GA V12 places on the rear bumper cavity is one of the most demanding engineering challenges in the Stallone programme. At 8500 rpm the four exhaust outlets discharge a high-volume, high-temperature gas flow that saturates the rear bumper cavity and raises local temperatures above the safe service range of production plastic components over sustained use. Mansory's carbon rear bumper air-outtake grills solve this with purpose-formed carbon panels that replace the OEM bumper's passive thermal apertures with directed extraction channels, forming part of the Mansory Body Kit for Ferrari 812 Superfast Stallone's integrated rear heat-management strategy. Beyond their functional role, these grills extend the Stallone's 3K twill carbon surface treatment to the rear bumper's detailed apertures, completing the aesthetic consistency that a fully specified programme build demands.

Construction & Materials

The grills are manufactured from pre-preg carbon fibre autoclave-cured at 125 °C and 3 bar with a heat-resistant epoxy matrix selected for continuous service at the elevated temperatures present in the rear bumper cavity. The 3K twill grill bars and frame use a resin system rated to 220 °C continuous — well above the 150–180 °C ambient temperatures measured in the bumper cavity during sustained circuit use. Grill bar spacing is engineered at 8 mm clear gaps to maximise free-flow area while providing the structural rigidity that prevents bar deflection under the aerodynamic pressure differential that forms across the grill face at speed.

Each grill assembly consists of the outer carbon frame, the bar array, and the attachment flange interfacing with the Mansory rear kit's bumper aperture surround. Frame-to-bar joints are secondary-bonded with structural film adhesive after the initial autoclave cure, providing bond strength exceeding the parent laminate's shear resistance — bars cannot detach under thermal or mechanical cycling. The matched left-right pair ships from the same autoclave batch for consistent weave tone, and the spring-clip plus two-bolt retention system allows tool-free removal for cleaning between track sessions.

• Weave: 3K twill, heat-resistant epoxy matrix rated to 220 °C continuous
• Cure: autoclave 125 °C / 3 bar — void content <1 %
• Grill bar spacing: 8 mm clear gap — maximised free-flow area
• Frame-to-bar joint: structural film adhesive, shear strength exceeds parent laminate
• Weight: approx. 0.18 kg per grill, 0.36 kg pair
• Supplied as matched left-right pair from the same autoclave batch
• Finish: UV-stable gloss clear lacquer; matte on request

Design & Visual Function

The grill's primary function is active extraction of hot air from the rear bumper cavity. Without directed exit apertures, this cavity accumulates thermal mass from the V12's exhaust, raising rear tyre shoulder temperatures by radiation and softening OEM plastic components over time. The grills create a low-pressure exit path: as the car moves forward, the low-pressure region aft of the bumper face draws air continuously through the grill bars, producing a speed-dependent extraction draft. This draft extracts more heat precisely when the naturally aspirated V12 is generating more of it — at high revs where the exhaust volume is greatest — making the grills functionally most relevant at the driving conditions where the 812 Superfast is most intensively used.

The grill bars' exit angle is set to discharge extracted hot air downward and rearward from the bumper face, directing the thermal plume away from the rear tyre contact zones and away from the diffuser exit region where it could disrupt rear-axle downforce flow. On a naturally aspirated V12 with four large-bore exhaust pipes, the thermal mass management function is more demanding than on a smaller-displacement engine — the F140 GA's exhaust volume per unit of power output is substantially higher, and directing where that gas goes after the tailpipes is part of what distinguishes a comprehensive aero programme from one that only addresses front-end airflow.

The visual contribution of the grills is one of deliberate detail resolution. Viewed from directly behind at close range, the grill bar arrays present precisely arranged 3K twill carbon lattice that catches raking light with the depth of an autoclave component. They transform what would otherwise be plain rectangular apertures in the bumper into graphic elements that signal the thermal engineering intent of the rear system, turning a functional necessity into an aesthetic asset consistent with the Stallone programme's standard of thorough, considered construction at every surface.

Compatibility & Fitment

Designed for the Mansory rear kit for the Ferrari 812 Superfast Stallone (F140 platform, 2017–2022) and not compatible with the OEM rear bumper, whose thermal aperture geometry differs. LHD and RHD equally served by the symmetric grill set. Compatible with both the standard stainless and optional Inconel titanium exhaust systems. Designed to work alongside the rear panel's inner heat-shield laminate as a complete rear thermal management assembly.

Installation & Reversibility

Each grill clips and bolts into the aperture surround of the Mansory rear kit via four-point spring clips plus two M4 anti-vibration bolts. Installation takes 15–20 minutes per grill. Spring clips allow tool-free removal for cleaning; M4 bolts prevent vibration loosening at high engine speeds. The grills are fully reversible — removal leaves the rear kit aperture surrounds intact and unmodified. Fit the supplied aperture blanks if the grills are removed for transport, as uncovered apertures at speed create turbulent buffeting through the cavity.

Pairing within the Mansory 812 Superfast Stallone Programme

The grills are functional components of the rear kit's thermal system and pair directly with the Mansory Rear Kit that hosts their aperture housings. Their thermal extraction function is complementary to the Mansory Rear Panel's ceramic inner heat-shield, which manages radiated heat from the exhaust at the quarter-panel zone while the grills manage the convective heat load within the bumper cavity. For high-speed rear-axle load above the bumper zone, the Mansory Rear Spoiler adds boot-lid Gurney-flap downforce that complements the grills' thermal function at the lower rear register.

Maintenance & Durability

The grills accumulate exhaust soot on inner bar faces — remove with a dry microfibre at each service. For heavier deposits, use a soft brush with warm water and pH-neutral shampoo. Outer lacquered bar faces respond to the same ceramic coating and wax protocol as other Stallone panels. Inspect spring-clip retention points annually for fatigue. If bar surface delamination appears from repeated thermal cycling, remove and replace the affected grill. Individual replacement grills are available from Mansory as service parts.

Lead Time & Warranty

Rear bumper air-outtake grills ship within 2–3 weeks of confirmed order. The 12-month manufacturing warranty covers delamination and void formation. Thermal degradation from non-standard exhaust modifications and impact damage fall outside warranty scope.

FAQ

Q: Can these grills be fitted to the OEM factory rear bumper?
A: No. The grills are shaped for the specific aperture geometry of the Mansory rear kit. The OEM bumper's thermal apertures have different positions and dimensions that are incompatible with the Mansory grill frames without modification work.

Q: How hot do the grill bars get during sustained track use?
A: During sustained high-rev circuit running, bars in the exhaust-adjacent position typically reach 120–150 °C surface temperature. The heat-resistant epoxy matrix is rated to 220 °C continuous, giving substantial thermal margin above the worst-case circuit operating condition. Bars cool rapidly once engine revs are reduced between sessions.

Q: Does the directed grill discharge affect the rear diffuser's downforce performance?
A: No. The exit angle directs hot air downward and rearward away from the diffuser's upper exit region. Mansory's CFD analysis of the 812 Superfast Stallone package confirmed that grill discharge does not create turbulent interaction with the diffuser wake at any point in the relevant speed range.

Q: Are the grills compatible with aftermarket exhaust systems beyond the OEM configurations?
A: Compatible with any exhaust system whose tip positions and outlet diameters are broadly similar to the OEM configuration. Non-standard systems that significantly increase radiated heat beyond the Inconel OEM system should be assessed for compatibility before fitting — contact Mansory with the exhaust system specifications for confirmation.

Q: Can individual grills be replaced after damage, or must a pair be ordered?
A: Individual grills can be ordered as replacement service parts. Mansory keeps them in production throughout the 812 Superfast Stallone programme's lifecycle. If replacing one grill from a different batch than the surviving grill, replacing both simultaneously is recommended for matched weave tone between the two sides.

Complete the Stallone rear build at Mansory Body Kit for Ferrari 812 Superfast Stallone. Enquire via WhatsApp +44 7488 818 747 or [email protected] for current availability and lead time.