1991 BMW 850i Stage II Twin-Turbo

CB73392 was originally owned by PGA Pro Mark Calcavecchia who commissioned the Dinan 8 conversion.

General Information

Chassis Number: CB73392
Production Date: 02/14/1991
Mileage: 50,725
Transmission: Automatic
Owner: J.R. Wappel
Location: Flemington, NJ, USA
Exterior Color: Gletscherblau (280)
Interior Color: Silbergrau Hell Nappa (0353)

Dinan Modifications


Stage II Twin-Turbo Package

  • 5.0L M70 V12
  • Twin turbochargers (10psi), dual air-to-air intercoolers and associated piping, valves and wiring
  • HP free flow exhaust system
  • Extrude honed intake manifolds w/ supplemental manifold gasket set
  • Engine electronics (Turbotronics 7 w/ top-speed delimiter)
  • Bored throttle bodies w/ larger mass air sensors
  • Dinan 8 rear badge


Automatic Transmission

  • Transmission cooler
  • Transmission chip and shift kit
  • High stall torque converter
  • 3.64:1 Limited slip differential (LSD)


Stage III Suspension

  • Performance spring set
  • Custom valved shocks/struts
  • 27mm (F) and 17.5mm (R) adjustable anti-roll bar set
  • Front camber plates


Stage III Brakes

  • 345 x 32 mm (F) and 328 x 20 mm (R) floating rotors
  • BMW Motorsports 4-pot (F) and mono-pot (R) calipers


Optional Wheel / Tire Package

  • 17″ x 9″ 3-piece performance wheels
  • 3/16″ hub extenders (F)
  • 275-40-ZR17 Yokohama AVS Intermediate tires

Misc. Mods:
  • Strong-Strut: Strut tower brace
  • BMW Europe: Smoked flash-to-pass (FTP) lights
  • BMW Europe: Headlights
  • Dinan: Aluminum pedal set
  • Dinan: Color matched floor mat set


Chassis CB73392 is a Glacier Blue 850iA originally owned by former PGA Pro Mark Calcavecchia.  He commissioned the Dinan conversion which consisted of the Stage II twin-turbo package, Stage III performance suspension package and wheel and tire package at a cost of over $25,000 in the early 90’s. The car was later sold through a broker in South Carolina to JR Wappel and shipped up to New Jersey where it has resided for the last 6+ years.

While it has racked up fewer than 1,000 miles in that time, it has been driven in excess of 135mph on Pocono Raceway (in the rain unfortunately) and featured in multiple events including the Greenwich Concours D’Elegance, East Coast Concours, Bimmerfest East (1st in class), Import Nationals (2nd in class), Patroon Concours (1st in class), Scarsdale Concours and many other local shows and meets.

Image Gallery