Porsche 911 Turbo Flachbau

Porsche 911 Turbo Flachbau

Coupé, 1987


  • Ultra-high performance, factory M505 slant nose 930 with low miles
  • Numbers-matching engine increased to 3.6 liters, 5-speed G50 transmission with short gears, suspension converted to Bilstein coilovers front and rear
  • Superb exterior paint, with sunroof and drip rail delete; immaculate interior with sport seats

Porsche 930 Flachbau for sale at ZWECK!

Zweck is pleased to offer a factory M505 slant nose 930 featuring a 3.6L engine, short-ratio 5 speed transmission, coilover conversion and much more. Throughout the 90s and 00s this 930 highly developed into the ultimate hot-rod 911 Turbo, with all work completed by period Porsche Motorsport institutions such as Andial and Dick Elverud. No expenses or considerations spared in making it an absolute performer; more comparable to a modified, watercooled 996 or 997 Turbo than its contemporaries.


United States

12910 SW 89 Ct
33176 Miami
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This slant presents spectacularly and without flaws, with an odometer showing 21 thousand miles (consistent with Carfax and service records). Powerful yet progressive, the power delivery of this 930 is better than any other CIS 930 we’ve encountered. The car is well mannered around town but comes on boost quickly when on throttle, benefitting from the combination of increased displacement and upgraded cams. Combined with the close-geared G50, optimized for the powerband of the car, it makes for an incredibly enjoyable driving experience. The Bilstein coilover setup is surprisingly compliant, comfortable when cruising but highly capable compared to original shock/torsion bar setup. As fantastic as the car looks–it’s even better to drive.

In August of ‘87, the car was sold new by George Follmer Porsche-Audi. The original owner wasted no time in seeking proper upgrades. In 1988, the 930 was brought to Andial — now Porsche Motorsport North America — and modifications from including a K27 turbo, larger intercooler, upgraded Bilstein shocks and stiffer torsion bars were installed.

After changing hands to the second owner in the early 90s, the more intensive modifications began, listed in detail at the bottom. Dick Elverud played a vital role in developing the car into its current performing state, and had a close relationship with the second owner of the car, enlarging the engine from 3.3 to 3.6 during one of his rebuilds and converting the trans to 5spd. Mr. Elverud is a highly-regarded Porsche race mechanic who fielded Porsche cars since the 1960s, from 906s to RSRs and 935s. The slant was used on road and track until the mid-2000s and driven infrequently thereafter, thus Dick rebuilt the engine again in 2015 after the car had sat for some time, with new bearings and seals throughout.

The interior is immaculate with no noticeable flaws to speak of, including the sport seats which are in excellent condition. The AC blows cold as well. The paint on the car is excellent. The second owner deleted the sunroof and drip rails / rain gutters, possibly after incurring some roof damage, and resprayed the exterior at the same time. Overall, the vehicle presents in excellent condition throughout and comes with COA, books/manuals, and most records dating back to 1987. Please do not hesitate to contact for more information or photos. VIN withheld but available upon request. Inspections are welcome and encouraged.


  • Last rebuilt in 2015 by Dick Elverud, famous 935 and IMSA engine builder
  • Displacement increased to 3.6l, built on original numbers-matching 3.3 case
    • 3.6l crankshaft (cross-drilled for oiling)
    • JE 100mm piston set for turbo engine
    • Porsche 100mm cylinders
    • Case machined for 100mm cylinders
    • Clearanced engine case & oil pump
    • Balanced crank, rods, & clutch assembly
  • K27 Turbo
  • Twin plug head conversion
  • Cams reground to 964 profile
  • Extrude-honed heads & intake
  • Raceware connecting rod bolts, case studs, head nuts, and billet washers
  • Titanium spring retainers
  • Garretson longneck intercooler
  • Powerhaus stainless exhaust system
  • HI-6 CD boxes (2)
  • MSD Blaster coils (2)
  • Front oil cooler


  • 5 speed G50/50 short bellhousing transmission conversion
    • Purchased from Patrick Motorsports
  • Rebuilt with close ratios / shorter gears
  • Limited slip differential, modified for increased lockup
  • Larger ring & pinion
  • WEVO short shifter


  • 23mm front and 30mm rear torsion bars
  • Bilstein coilover conversion with Eibach springs
  • Upgraded sway bars F/R (front is “through-body”)
  • 993TT front brake calipers
  • Stainless steel braided brake lines
  • Brake ducts


  • Sunroof delete
  • Rain gutter / drip rail delete
  • DP front valence
  • 993 / aero mirrors
  • 993 door handles and gaskets

Factory Highlights per COA:

  • Slant Nose – per PCNA, 1 / 144 factory-produced 911 Turbo Slantnose Coupes in 1987; 1 / 369 between 1987-1989.
  • Limited Slip Differential
  • Sport Seats w/ Electric Height Adjustment (L/R)
  • Electric Sliding Sunroof (since removed)
  • Blaupunkt Radio ‘Reno’
  • Alarm System
  • Goodyear Tires
  • California Emissions
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Year of construction: 1987
Model: 911 Turbo Flachbau
Body: Coupé
Series: 930
Mileage: 21575 mi
Power: 475 HP
Cylinder capacity: 3,6 Liter
Steering: left
Transmission: Manual
Drive: Rear drive
Fuel: Gasoline
Configuration: Air conditioning
Interior color: Black
Interior material: Leather
Exterior color: Red
Manufacturer color code (exterior): Indischrot/Guards L80K
Matching Numbers: Yes
New/Used: Used car
Ready to drive: Yes
Registered: Yes
Country of delivery: United States

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