Air outtake splitter for Rear bumper Mansory for Mercedes-AMG S63E

Mansory Air Outtake Splitter for Rear Bumper for Mercedes-AMG S63E

Mounted in the rear bumper just above the trailing edge of the rear wheel arch, the Mansory air-outtake splitter is the carbon blade that takes the hot air rising out of the rear arch and channels it laterally before it can reattach to the rear quarter and disturb the diffuser inlet. On a long-wheelbase W223 saloon weighing 2,510 kg, with the AMG biturbo V8 PHEV drivetrain pushing 802 hp through 4MATIC+ AWD, the rear-axle thermal load is non-trivial: the rear-mounted electric motor, the inboard portion of the 13.1 kWh HV battery cooling loop, and the AMG quad-tip exhaust collectors all radiate heat into the cavity behind the rear wheel. This blade gives that hot air a clean exit trajectory. It belongs in the parent Mansory Carbon Fiber Body kit set for Mercedes-AMG S63E.

Construction & Materials

The blade is small but it lives in a high-temperature, gravel-strike zone, so the layup combines an elevated-Tg resin system with an impact-tolerant inner core.

• 3K 2×2 twill outer A-side surface (forged-look option)
• Pre-preg vacuum-bag autoclave cure, 130 °C, multi-axial fibre orientation
• Wall thickness 2.0–2.4 mm at the visible blade, 3.0–3.6 mm at the OEM fascia interface
• Net dry weight 0.45–0.6 kg per side
• Stainless threaded inserts at OEM AMG bumper-skeleton mount points
• 3M VHB 5952 along the inner return; no drilling required
• UV-stable 2K clear lacquer with extra hardness for stone strike (gloss / satin)
• Substrate prep: solvent wipe, 3M Cleaner-Primer 94, masked low-tack on bond pads

Design & Visual Function

The aero job is conceptually the inverse of the front splitter: the front splitter gathers and shapes the airflow entering the underbody, the rear-bumper outtake gives the hot air leaving the rear arch a defined exit direction so it does not re-attach to the body and pollute the diffuser inlet boundary layer. On the OEM W223 the rear-arch hot air spills sideways and upward, and on a hot day at sustained autobahn pace some of that hot column drifts toward the inboard side of the diffuser, raising the local intake-air temperature for the cooling air the diffuser draws past. The Mansory blade pulls the hot column outward and downward by 12–18 mm before letting it shed, which means the diffuser inlet sees cleaner, cooler ambient air.

The shaped lip on the trailing edge of the blade is a small but deliberate aerodynamic feature: it carries a 2 mm radiused turn that prevents the boundary layer from separating prematurely off the carbon surface, which would otherwise create a low-pressure pocket immediately behind the blade and undo the work the blade is doing. That radius is set during the autoclave bake and cannot be sanded back during a touch-up, which is why the QC sheet records its dimension at three points along the trailing edge.

Visually the part stretches the apparent width of the rear bumper and pulls the eye away from the centre. On a long-wheelbase saloon that benefit is meaningful — the OEM rear quarter is visually very long, and the carbon blades give it a defined termination. The 3K twill is biased so the diagonals run rearward, suggesting motion away from the cabin, which is in keeping with the AMG aesthetic at the rear.

For AMG Night Package cars satin lacquer keeps the blade flush with the blacked-out bumper trim. For AMG Carbon Package cars the gloss finish coordinates with the AMG-supplied carbon rear-quarter accents.

Compatibility & Fitment

Engineered for Mercedes-AMG S 63 E PERFORMANCE (W223) saloon, model years 2023+. The blade uses the OEM AMG rear bumper-skeleton studs as its datum, just inboard of the trailing edge of the rear arch. AMG Night Package and AMG Carbon Package cars are supported. The OEM AMG quad-tip exhaust geometry is the alignment reference — the blade sits well above the exhaust exit plane, so radiated exhaust heat is not a concern. AIRMATIC ride height is irrelevant; the part lives in the upper bumper plane. Rear parking sensors and reverse-camera frame are not disturbed. Cars optioned with AMG Carbon Ceramic Brakes will see a small benefit at the rear brake-cooling intake by virtue of less hot-air recirculation around the rear arch.

Installation & Reversibility

Plan 35–55 minutes per side with the rear bumper still on the car. Required tools: 8/10 mm sockets, plastic trim picks, isopropyl alcohol, 3M Primer 94, low-tack masking. Workflow: remove the OEM AMG rear-bumper trim filler that occupies the outtake position (typically two screws and a clip array), wipe and prime the bumper-skeleton bond pads, mate the blade to the studs, torque the M6 fixings to 8 Nm, press the VHB seam home with a roller for 30 seconds, allow 24 hours cure before a pressure wash. Reversibility is excellent — the OEM filler reseats with the original clips, and the bumper-skeleton studs are reusable indefinitely. No drilling and no permanent bonding to painted panels. If a blade is later removed for a touch-up of the surrounding paint, the VHB releases cleanly with localised heat from a 200–250 °C heat gun and dental floss; the bumper-skeleton primer should be re-applied before refit because the OEM bond pads are typically scrubbed by the original VHB removal.

Pairing within the Mansory Mercedes-AMG S63E programme

Most often combined with the Diffuser directly inboard, with the Rear decklid spoiler performance for the upper rear-fascia treatment, and with the Side skirts lip to keep the rocker-to-bumper carbon shadow line continuous from front arch to rear arch.

Maintenance & Durability

The blade is in a brake-dust and salt zone so it should be washed on the same cadence as the rear arch — at least every two weeks in winter, and any time the car has been on a wet motorway run. pH-neutral shampoo with a soft mitt is the standard practice. Avoid acid-based wheel cleaners drifting onto the blade — the blade will be the first place a stray mist of acid will haze the lacquer because of the proximity to the wheel-well area. A quarterly ceramic spray sealant keeps the lacquer's hydrophobic behaviour topped up. Heat from the AMG quad-tip exhaust does not reach the blade directly, so the layup's elevated-Tg resin is engaged only marginally; the cosmetic finish is rated for 9–12 years given the part's relative thermal shelter. Stone chips at the leading edge should be sealed with clear UV epoxy within seven days.

Lead Time & Warranty

Lead time 2–4 weeks. The blade is small and not LED-equipped, so it is among the faster pieces in the kit. Custom finishes (matte, satin, forged-look) add roughly one week. Warranty: 12 months against manufacturing defects — delamination, voids, fitment, clear blistering — counted from delivery. Damage from kerb impact, stone chip propagation, or chemical staining from acid wheel cleaners is not covered. Each blade ships as a left/right pair in a foam cradle, with the QC sheet documenting weave alignment under raking light.

FAQ

Q: Are the left and right blades different parts?
A: Yes — they are mirror-image mouldings. Left and right are clearly marked on the inner return.

Q: Is the blade compatible with the AMG quad-tip exhaust?
A: Yes. The blade lives well above the exhaust exit plane and does not interfere with any exhaust-tip orientation.

Q: Will it disturb the rear parking-sensor array or reverse-camera image?
A: No. The blade sits inboard of the parking-sensor cluster and below the reverse-camera projection cone.

Q: Does the AMG Night Package finish coordinate with the blade?
A: Yes — specify a satin finish to match the AMG Night Package's low-reflectivity register, and the blade will read as a depth gradient rather than as a separate carbon part.

Q: Is there an effect on rear lift at high speed?
A: Marginal — the primary benefit is thermal management of the rear-arch column and steadiness of the diffuser inlet, not a measurable single-number downforce gain.

Q: How does the blade interact with the diffuser if both are fitted?
A: Synergistically. The blade prevents hot-air re-attachment that would otherwise pollute the diffuser inlet, so the diffuser sees cleaner ambient flow and its Venturi effect is more consistent.

Q: Does the blade affect rear-fog visibility or any rear-lighting projection?
A: No. The blade sits inboard of the rear-fog cluster and below the upper bumper plane that carries the reverse and tail elements; no lighting cone is interrupted.

Q: Will the layup withstand a winter de-icing salt regime?
A: Yes. The elevated-Tg resin and 2K UV clear are formulated for road salt exposure, but a six-monthly ceramic top-up extends the lacquer's hydrophobic life and keeps salt from finding micro-cracks at chip sites.

Combine with the diffuser and decklid performance spoiler to lock the rear aero zone into a single coordinated programme. To configure your build, message WhatsApp +44 7488 818 747 or write to [email protected].