Side set low flap Mansory Carbon for Ferrari 488 Siracusa 4XX

Side Set Low Flap — Mansory Carbon for Ferrari 488 Siracusa 4XX

Side skirts are not a styling part on a properly engineered aero kit — they are the seal between the two pressure regimes the front and rear bumpers create. The 4xx low-flap side set is the road-spec member of that pair on the Siracusa programme. It runs the full length of the rocker panel between the front bumper trailing edge and the rear bumper leading edge, and carries a shallow lower flap along its bottom edge that prevents high-pressure side air from spilling under the floor and disturbing the underbody flow the front and rear kits depend on. Inside the wider Mansory Carbon Fiber Body kit set for Ferrari 488 Siracusa 4XX programme this part is the connective tissue between the front and rear aero — fit the front and rear low-flap kits without it and you leave the underbody flow exposed to side-air contamination, losing a measurable share of the download both ends were engineered to deliver.

Construction & Materials

Each skirt is laid up as a single carbon shell with the lower flap co-cured into the rocker face, so the visible carbon line runs continuously from the front of the door cut-out to the rear quarter without any overlap joint. The fixing brief is straightforward: the skirts replace the OEM rocker covers and bolt onto the OEM rocker thread inserts using stainless hardware, with the carbon laminate isolated from the metal by stainless ferrules so no fastener torque is taken directly through the cloth. Set-up time on the bench is short because the OEM rocker geometry is well-defined and the carbon shell drops onto the threads in one move.

The flap is reinforced with a unidirectional spine running its full length, because at speed the flap experiences a steady downforce vector that would peel a thin laminate over time. The spine takes that load and spreads it back into the rocker face.

• Outer ply: 3K 2x2 twill aerospace prepreg, weave aligned along the rocker centreline so the diagonal grid runs continuously between the front and rear arches
• Backing: bias-laid 200 gsm plus a unidirectional spine along the flap full length
• Cure: autoclave at 125 °C, 6-bar consolidation, 90-minute dwell
• Resin: high-Tg epoxy, 150 °C continuous service, road-environment specified for sun-load on dark carbon
• Wall thickness: 2.4–2.8 mm across the rocker face, 3.5 mm through the flap, 4.0 mm at the flap root
• Mounting: OEM rocker thread inserts and OEM under-rocker fasteners — no drilling of the bodyshell
• Hardware: stainless ferrules at all fastener points, supplied with stainless bolt set
• Finish: deep gloss 2K clear standard, satin matte and exposed-weave matte black available

Design & Visual Function

The aero work the skirt does is at the lower flap edge. As the car moves forward, side air at higher static pressure than the underbody flow tries to push inward under the rocker line. Without a sealing flap that side air would spill into the floor area between the front splitter outlet and the rear diffuser inlet, contaminating the floor and unloading both ends of the car. The low flap presents a small but continuous pressure dam along the rocker line, holding side air outboard and keeping the floor pressure regime clean. The shallow flap height is chosen to balance against the road-spec front and rear: deep enough to seal at autobahn speed, not so deep that ride height becomes a daily compromise.

Visually, the skirt is the line that defines the side profile of the car. Mansory tooling sets the carbon weave running square to the rocker line so the diagonal grid stays continuous from the front bumper trailing edge through to the rear bumper leading edge — when the car is photographed in profile, the eye reads one unbroken sweep of carbon at the rocker, which is the visual signature of a properly co-ordinated aero programme. The flap reads as a clean shadow line below the rocker rather than as a separate bolt-on part.

Estimated steady-state contribution at 250 km/h is in the order of 6–10 kg of additional combined-axle download recovery — not a peak figure on its own, but the share of front and rear download that the floor would otherwise lose to side-air contamination. The skirt is therefore best understood as protecting the investment made in the front and rear aero rather than producing a number of its own.

The flap profile is also tuned around the 488 floor reference, which sits noticeably higher than older mid-engined Ferraris. A skirt designed for an older platform would either run out of flap to reach the floor or project a flap so deep it would scrape on every driveway entry. The Siracusa low flap drops just far enough to present a continuous pressure dam without ever sitting below the OEM front bumper underside line — meaning the skirt never becomes the lowest point of the car, and ground clearance is dictated by the front splitter as it should be. Owners coming from older 458 or F12 builds are sometimes surprised that the skirts do not visibly extend below the rocker line; that restraint is by design, not an aesthetic compromise.

Compatibility & Fitment

Fits Ferrari 488 GTB coupé and Ferrari 488 Spider, model years 2015–2020. OEM rocker geometry is shared between coupé and Spider, so the skirts cross freely between body styles. The set is matched to the road-spec front and rear low-flap kits — it will physically fit alongside the high-flap front and rear, but the flap height is not tuned to that pressure regime; track-spec builds should pair the high-flap front and rear with the matching high-flap side set instead.

Installation & Reversibility

Quick job. Remove the OEM rocker covers — they are clipped and bolted to the rocker thread inserts — and replace with the carbon set using the supplied stainless hardware. No drilling, no chassis modification, no paint work needed because the bodyshell behind the skirt is OEM. Total bench time is around 1.5–2 hours for the pair. Reversibility is total — OEM rocker covers refit with their original clips and bolts whenever the car is sold or returned to factory specification.

Pairing within the Mansory Ferrari 488 Siracusa programme

The road-spec side set is engineered to live alongside the Front kit 4xx low flap and the Rear kit 4xx low flap — fitting all three completes the road-biased aero loop and is the way the geometry was tuned in the first place. Builds that later add a circuit-day capability tend to swap up to the Side set high flaps and the matched high-flap front and rear when they switch the wider aero brief over to track use.

Maintenance & Durability

Skirts take stone chips on the leading edge and wash residue along the lower flap. Use pH-neutral shampoo, a soft mitt and avoid pressure washers within half a metre of the leading edge. Check the flap underside after driveway entries and exits for kerb scrapes — most flap damage is low-speed kerb contact rather than aero load. UV-stable 2K clear holds colour across the lifetime of the car. Stone chips on the leading edge can be touched in without disturbing the laminate. Expected service life is in line with the rest of the carbon programme.

Lead Time & Warranty

Lead time is 2–3 weeks from confirmed order — slightly faster than the bumpers because the autoclave cycle for the skirts is shorter and the trim work is less involved than on the bumper assemblies. Twelve-month warranty against manufacturing defects covers laminate voids, delamination, ferrule pull-out and clearcoat failure. Kerb impact damage, aggressive-cleaner damage and damage caused by incorrect installation are excluded from the warranty.

FAQ

Q: Will the low-flap skirts work with the high-flap front and rear?
A: They will physically fit, but the flap height is tuned for the road-spec pressure regime; track-spec builds should fit the matching high-flap side set instead.

Q: Are coupé and Spider skirts the same?
A: Yes. The 488 rocker geometry is shared between body styles, so the same carbon set fits both.

Q: How much download does the skirt set add?
A: On its own, in the order of 6–10 kg recovered at 250 km/h. Its real value is preserving the floor pressure regime that the front and rear kits depend on, rather than producing a peak figure of its own.

Q: Do I need to drill the rocker?
A: No. The skirts mount on the OEM rocker thread inserts using the supplied stainless hardware. No bodyshell modification.

Q: Can I fit them myself?
A: Yes, if you are confident with trim work. Plan around 90 minutes for the pair on stands or ramps. A body shop will do the same job in an hour.

Fit the side set together with the matching front and rear low-flap kits to close the aero loop the programme was tuned around end-to-end. CTA: WhatsApp +44 7488 818 747 or [email protected].