Project Carbon Longtail

Near-covered front wheelhouses with vertical outer lips to manage wheel wake and reduce turbulence
Dual dive planes per side and flat underbody shelf-style skirts with a concave acceleration channel
Seven-channel deep rear diffuser with defined venturi tunnels and controlled blunt trailing edges
Tri-element swan-neck rear wing with adjustable flap and full-width Gurney for endurance stability

Set at dusk on a European circuit, the car reads like a prototype that wandered out of a paddock photo archive—low camera height, overcast light, and minimal decals with a simple matte-white “07.” The longtail deck, covered wheels, and deep diffuser do the talking, with the Arctic Blue over midnight tones catching the edges of every chamfer and vent.

OZ Racing Chrono forged magnesium: 19x9.5 front
19x11.5 rear
Michelin Pilot Sport Cup 2 slick-spec: 315/30-19 front
345/30-19 rear
Ride height target: ~35mm front / ~40mm rear ground clearance with hydraulic bumpstops
Wheelhouse packaging designed around 90% front coverage and full rear enclosure for aero cleanliness

N52 3.0L inline-six retained but shifted ~75mm rearward for near front-mid mass distribution
Sidepod-style cooling with ducted inlets and defined extraction through fender/roof outlets for sustained heat load
Motorsport brake cooling plenum fed by high-pressure nose intake and wheelhouse ducting
Exhaust routed to a central quad-exit integrated within the diffuser with heat-shielded carbon surrounds

Carbon/FRP hybrid outer skins over a reinforced substructure to support long overhangs and aero loads
Wheelhouse covers built as serviceable panels with quick-release fasteners for tire and brake access
Diffuser and wing mounts tied into chassis hardpoints with load paths designed for sustained downforce
Ducting treated as a system: sealed inlets
smooth radii
and controlled exits to prevent pressure bleed

Project Carbon Longtail takes the E90 328i—one of BMW’s most familiar silhouettes—and drags it into the endurance-prototype rulebook without losing the sedan’s DNA. The greenhouse, four-door proportions, and window lines stay readable, but everything below the beltline becomes aero-first: a forward-thrown wedge nose, near-closed front wheelhouses, and a tail stretched long for stability at speed.

This isn’t a cartoon widebody. It’s a believable “works skunkworks” exercise built around airflow control, thermal management, and track width—front +190mm, rear +230mm—so the stance supports the aero rather than just the look. Carbon surfaces, ducting, and a longtail deck turn the E90 into something that reads Group C from 50 meters, yet still feels engineered from the platform up.