| Donor car: BMW M3 CSL E46 | €100,000 | mobile.de CSL listing 114,930 EUR at 94,800 km suchen.mobile.de; autobild 81,245 EUR at 52,000 km; Hagerty high bid $147,150 |
| BMW P58 engine, part number 05748334245KT | €86,000 | bmwblog.com ($100,000 at Turner / ECS, exchange rate only; no second source confirms the price) |
| M4 GT3 Xtrac six-speed sequential transaxle with LSD and electro-hydraulic shift | €75,000 | Estimateestimate: 60-90k EUR; Xtrac racing gearboxes GBP 33-52k before options gt40s.com |
| Driveshafts, torque tube, transaxle mounts for the E46 shell | €10,000 | Estimateestimate: custom CV shafts and torque tube for an E46 shell |
| P58 ancillaries: radiators, intercoolers, dry-sump tank, intake | €10,000 | Estimateestimate |
| Race electronics: power distribution, loom | €17,000 | Estimateestimate: Bosch PBX 190 10,512 EUR net xtramotorsport.com, loom 5-8k EUR; the engine ECU is listed per stage (Stage 3 runs a MoTeC M150 in its place) |
| 100 l FIA fuel cell + pumps | €4,800 | ogracing.com ($2,873) + 1,500 EUR pumps and collector (estimate) |
| Race seat + harness | €2,500 | Estimateestimate: FIA seat 1,100-2,000 EUR + harness 500 EUR |
| Safety extras: plumbed extinguisher, kill switch | €1,000 | Estimateestimate: not in the spec, but a real car needs them |
| Vinyl sun strip | €100 | Estimateestimate |
| Öhlins TTX 4-way dampers, M4 GT3 specification, set | €20,000 | Estimateestimate: 4.5-5.5k EUR per GT damper; UP x Öhlins TTX 4-way set $14,995 bulletproofautomotive.com |
| Flossmann GTR wide body: front bumper, fenders, skirts, rear flares, rear bumper, roof scoop, carbon splitter + canards | €9,000 | Estimateestimate: GRP prices from an older bmw-syndikat.de forum post x 1.6 for 2026 + 1,000 EUR splitter and canards |
| GT3 louvre race hood, carbon, with pins | €2,200 | Estimateestimate: Flossmann ALMS hood 1,100 EUR in GRP |
| Welded full FIA cage, kit only (fitting in labour) | €1,800 | gt2i.ch (CHF 1,094) |
| Dash display pod + 12 shift lights | €3,000 | Estimateestimate: AiM MXG + shift-light module + pod fabrication |
| M4 GT3 steering wheel with quick release | €4,300 | Estimateestimate: the GT3 line + 300 EUR |
| M4 GT3 centre-lock wheels 18x12 / 18x13, set | €7,500 | Estimateestimate: about 1,850 EUR each for genuine M4 GT3 spares; BBS E88 12x18 1,535 EUR |
| Centre-lock hubs, nuts, wheel gun | €6,500 | Estimateestimate: as on the GT3 |
| Pirelli DHF 325/680 + 325/705, set | €2,400 | Estimateestimate: about 15 % above the 275/305 set |
| Twin 2.5" side-exit exhaust with heat shield, fabricated | €4,500 | Estimateestimate |
| Dry-break refuelling coupling + vent | €1,600 | Estimateestimate: no public Krontec price; dry breaks at fuelsafe.com |
| Rennsport chrome lettering | €250 | Estimateestimate |
| Labour: swap 750 h, wide body 80 h, welded cage 100 h | €158,100 | Estimateestimate: 930 h x 170 EUR (net; German workshop rate over 200 EUR/h incl. VAT, GDV / auto motor und sport 7 Oct 2025, auto-motor-und-sport.de) |
| Full respray of the wide body + livery | €15,000 | Estimateestimate |
| Calibration, dyno, shakedown | €8,000 | Estimateestimate |
| Bosch Motorsport engine ECU, M4 GT3 type | €18,000 | Estimateestimate: ECU 15-20k EUR, moved out of the common race electronics so Stage 3's MoTeC M150 does not count twice (Bosch MS 6.4 EVO $17,419 in a search snippet, currency likely AUD; research/2026-10-15-preischeck/sources.md) |
| Race clutch, carbon multi-plate | €6,840 | Estimateestimate: Sachs RCS 2/140 carbon clutch 6,836 EUR; Tilton 5.5" OT carbon 3-plate (about 1,020 Nm) $4,675-7,625 (research/2026-10-15-preischeck/sources.md) |
| GT3 brakes: front 390 mm 6-piston, rear 380 mm 4-piston, discs, pedal box, ducts | €16,000 | Alcon GT 390 front kit for the G8x $9,075 (BimmerWorld) + AP Radi-CAL rear kit CP9451 for the E46 $4,849 (elite-performance) = about 11,970 EUR (exchange rate only) + about 4,000 EUR pedal box and ducts (estimate); AP CP9668 caliper 1,133-1,394 EUR each raceandrally.com |
| APR Performance GTC-300 67" E46 wing AS-106743 | €1,800 | vividracing.com (MSRP $1,575) |
| Flossmann GTR carbon diffuser | €2,500 | vividracing.com (M3-R diffuser $2,200) |