Air outtake splitter Mansory carbon for Rolls-Royce Cullinan Coastline

Air Outtake Splitter — Cullinan Coastline

The Air Outtake Splitter is the closing carbon detail in the Mansory Coastline programme for the Rolls-Royce Cullinan — a small but consequential fin set that lives at the front-fender / front-bumper air outlet, immediately downstream of the radiator pack and the twin-turbocharged 6.75-litre V12. Its job is twofold: extract underhood heat with the calm assurance befitting a coachbuilt SUV, and turn an otherwise utilitarian vent into a piece of jewellery that reads like a tailor's stitch on the Cullinan's flank. Specified within the wider Mansory Body Kit for Rolls-Royce Cullinan, this part is the visual full-stop that carries the eye from the Pantheon grille and Spirit of Ecstasy down the bonnet shutline, across the front fender and into the door cavity — Coastline grace, finally exhaled.

Important catalogue note. The Cullinan Coastline roster contains a separately listed part with the slug aur-outtakes-spliter-... (typo preserved verbatim) which addresses the rear bumper outtakes. The card you are reading — air-outtake-splitter, correct spelling — is the front piece. They are related in language but quite different in geometry, mounting and aerodynamic role. Specify accordingly.

Construction & Materials

Mansory's carbon shop produces the Coastline air-outtake splitter as a thin-wall composite assembly with a bonded mounting flange. The visible face is laid up in 3K twill 2×2 prepreg, oriented so the diagonals follow the natural rake of the Cullinan front fender — the weave does not fight the metalwork above, it agrees with it. Cure is autoclaved at controlled ramp; trim is five-axis machined; the lacquer is hand-flatted and re-polished before despatch.

The fins themselves are slender enough to feel architectural rather than aggressive, the leading edges micro-radiused so they read as drawn rather than cut. Where the splitter meets the painted body the carbon is rebated by a fraction of a millimetre, so that the gloss-on-gloss transition is shadowed rather than abrupt — a coachbuilt cue that elevates the part from accessory to bespoke fitment.

• Layup: 3K twill 2×2 prepreg, 4–5 plies on the visible skin, additional uni reinforcement at the mounting flange.
• Cure: autoclave, controlled ramp, full vacuum debulk; mould-finished both faces.
• Wall thickness: 1.6–2.2 mm visible area; flange ~3.0 mm with bonded reinforcement.
• Weight (front splitter set per side): approximately 0.45–0.65 kg depending on fin count.
• Fixing: stainless threaded inserts, butyl gasket, marine-grade adhesive bead at the perimeter.
• Finish: deep-gloss UV-stable lacquer (default) or satin/matte; bespoke colour-matched paint-out of the carrier panel optional.
• Hardware kit: stainless fasteners, gasket, install template, alignment shim set.
• Provenance: Mansory build tag traceable to the Cullinan Coastline programme.

Design & Visual Function

Aerodynamically the brief is calm extraction. The Cullinan's twin-turbocharged V12 plus charge-air coolers ask a great deal of the radiator stack, and on a heavy SUV the heat that reaches the engine bay at low road speeds — port-cochere creep, valet manoeuvres, school-run idle — has to leave somewhere. The factory front-fender outlet does that quietly. The Coastline splitter sharpens the exit: its fins guide hot air rearward and slightly outward along the body side, away from the A-pillar and the door-handle plane, so that what reaches the rear-view mirror cavity is undisturbed. The intercooler boost air sees a stiffer pressure gradient out, and at motorway speeds the underbonnet plenum runs marginally cooler.

Visually the part anchors the front three-quarter view. Stand at the bumper corner and the eye runs from the Spirit of Ecstasy back along the bonnet, jumps the shutline onto the front fender — and the splitter is exactly where the line wants to land. With the lacquered weave catching low light, the fender appears longer and the wheelarch tauter; with a paint-out finish the splitter recedes and the carbon engine-bonnet bar (if specified) becomes the headline. Both reads are correct, depending on owner taste and on whether the car wears a saturated bespoke RR colour or a quiet metallic.

The fins relate, geometrically, to the verticals of the Pantheon grille frame and to the Coastline front-mask treatment — they are not arbitrary. Owners who specify the front-grill-frame in exposed carbon will want the air-outtake splitter to match weave direction; the bonnet bar and the front-fender carbon panels then cascade downward through the same vocabulary, which is the entire point of the Coastline programme.

Compatibility & Fitment

Designed for the Rolls-Royce Cullinan, 2018 onwards, Standard and Black Badge, Series I and the Series II Coastline facelift. The splitter mounts to the front-fender or front-bumper outlet aperture using OEM hard points augmented by bonded flange — no chassis drilling, no irreversible cuts. OEM parking-sensor function is preserved (this part lives well above the front-bumper sensor band). Coach-door geometry, air-suspension self-levelling sensors, AdBlue fill, and the rear-hinged door check-strap are unaffected. The splitter is sized for the Cullinan front mask only — it is not a fit for Phantom or Ghost, whose front-fender outlet geometry is entirely different.

Installation & Reversibility

Fitting time is approximately 60–90 minutes per side in a Rolls-Royce-certified body shop. The fender liner is partially dropped, the OEM outlet trim — if present — is removed, the carrier surface is prepped, the bonded flange and threaded inserts are aligned with the supplied template, and the splitter is set with marine-grade adhesive plus mechanical fasteners. The lacquer is finally hand-buffed at the join. Reversibility is total: removal returns the panel to OEM appearance with the threaded inserts trimmed and a paint touch-in. Because the part sits in a high-temperature airstream, the install shop should follow the bonding system's manufacturer cure schedule before road use; do not rush this — the Cullinan engine bay runs warm.

Pairing within the Mansory Cullinan Coastline programme

This is the eighteenth and final part in the Coastline carbon programme for the Cullinan, and the most coherent way to specify it is alongside its immediate visual neighbours and its functional cousin at the rear:

• Front fenders (Coastline) — the panel on which this splitter sits; specify both together for weave continuity and a single fitment session.
• Air intakes cover (Coastline) — the inbound counterpart at the front mask; intakes in, outtakes out, the air-handling story closes.
• Aur outtakes spliter — Coastline (rear, slug typo verbatim) — the rear-bumper outtake fin set; same vocabulary, opposite end of the car. Specifying both fronts and rears keeps the carbon argument symmetrical.

That trio — front fenders, front air-intakes cover, and the rear “aur outtakes” — frames the air-outtake splitter on three sides and turns four discrete carbon parts into one unbroken thermal-management language.

Maintenance & Durability

Treat the lacquered weave as you would a fresh saloon paint surface. A pH-neutral shampoo and a soft microfibre wash mitt are the entire toolkit; pre-rinse to lift grit before any contact, and dry with a plush waffle towel. Avoid alkaline degreasers, ammonia wheel cleaners and abrasive sponges — those are what kill lacquer over carbon, and on a part this close to a hot exhaust pathway and its rock-chip exposure that matters more than usual. A high-quality ceramic coating extends the lacquer service life and resists the bug-strike etching that an SUV picks up on long-distance runs. PPF over the leading face is recommended where an owner uses the car for weekly motorway miles or in heavy summer insect conditions.

Should the splitter ever be chipped, do not attempt to wet-sand the carbon — repair is by lacquer touch-in from a Mansory-trained finisher, and in the rare case of a fin fracture the part is replaced rather than welded. Keep the original build-tag identifier; it speeds re-order. Underbody pressure-washing should be done with the lance held at low pressure and at angle — a direct pressure-washer jet into a carbon fin edge is the single most common way owners damage these parts.

Lead Time & Warranty

Lead time is typically 4–8 weeks from order confirmation, reflecting Mansory's bespoke production cadence and the lacquer-flat-and-polish workflow. Twelve-month warranty against manufacturing defects from date of fitment.

FAQ

Q: Will this affect the Cullinan's airflow or trigger any warning?
A: No. The splitter is downstream of the radiator pack and works with — not against — OEM extraction. There is no sensor in the outlet path; nothing will warn.

Q: Black Badge fitment?
A: Yes. Black Badge shares fender and outlet geometry with Standard Cullinan; the splitter fits identically. Owners often pair it with a paint-out finish to keep the Black Badge palette monolithic.

Q: How is this different from the rear “aur outtakes spliter”?
A: Different part entirely. The rear piece sits in the rear-bumper outtake recess and addresses underbody airflow at the back of the car. The front air-outtake splitter — this one — vents engine-bay heat. Specify both for symmetry.

Q: Can I specify a paint-out finish to match my coachwork colour?
A: Yes. Mansory will paint-out to a bespoke RR colour; lead time may extend by 1–2 weeks. The carbon weave can also stay exposed under deep-gloss lacquer if you prefer.

Q: Will it survive a typical SUV usage profile — school run plus long-distance?
A: Yes, with the maintenance routine above. PPF on the leading face is the single most useful step for owners doing high-mileage motorway work.

Q: Does it affect air-suspension ride-height or approach angle?
A: No — the part lives well above ride-height and approach-angle critical zones. Lift mode and self-levelling are unaffected.

Specify the air-outtake splitter alongside the front fenders and the air-intakes cover for a single coherent front-end carbon argument; close the loop with the rear aur outtakes spliter to extend the language to the back of the car. To configure your Cullinan Coastline build, reach us on WhatsApp +44 7488 818 747 or write to [email protected].