
1990 Porsche 911 · Singer Turbo Study
Singer Turbo Study born in May 2025, with a 3.8-liter twin-turbo flat-six, 503 hp, six-speed manual, rear-wheel drive, PTS Azzuro Thetys Metallic, Boomerang leather, carbon-fiber bodywork.
257 mimanual
Builder
Singer Vehicle Design has reimagined customer-owned Porsche 911s in Los Angeles since 2009, when Rob Dickinson founded the shop and named it for Porsche race engineer Norbert Singer and his own years as a vocalist. Every commission starts with a Type 964 built between 1989 and 1994 that the client already owns, and Singer is not a Porsche-affiliated manufacturer. The Classic keeps a naturally aspirated Mezger flat six in 3.6, 3.8, and 4.0 liter form, up to 390 horsepower, with a six-speed manual. Classic Turbo, from 2022, is a 930 homage with a twin-turbocharged 3.8 rated at 510 horsepower in official material. DLS, engineered with Williams Advanced Engineering in 2018, revs past 9,000 rpm, and DLS Turbo followed in June 2023 with 710 horsepower SAE net. Close to 500 cars have been delivered since 2009, with waits near three years.

GarageScout Take
Four buying forks sit under one roof, and all four are Type 964. Classic is the naturally aspirated car: a Mezger flat six in 3.6, 3.8, or 4.0 liter displacement, up to 390 horsepower, six-speed manual, carbon bodywork over the original 964 monocoque. Classic Turbo, launched in 2022, answers the 930 with a twin-turbocharged 3.8. DLS, developed in 2018 with Williams Advanced Engineering and with Hans Mezger and Norbert Singer consulting, is the naturally aspirated extreme at roughly 500 horsepower past 9,000 rpm, capped at 75 cars. DLS Turbo, announced in June 2023, draws on the 934/5 and is limited to 99 cars at 710 horsepower SAE net in official material, described elsewhere as roughly 700 plus. There is no Singer 993 product line.
Power and price figures do not agree across sources, so treat the spread as part of the buying question. Singer's official material rates Classic Turbo at 510 horsepower, while Wikipedia records 450 or 510 and Top Gear cites 450 and 510 depending on specification. On money, Top Gear puts Classic Turbo near £850,000 excluding the donor car, and Road & Track quotes $1.1 million to $1.4 million on top of the donor. DLS was reported by Car and Driver at $1.8 million. Availability is also contested: a 2025 Road & Track piece states the naturally aspirated Classic is no longer available, while Singer's own Classic page still describes the naturally aspirated car.
Supply, not specification, is the real constraint. Top Gear reported over 300 Classic Turbo orders against a wait of about three years, and the slant-nose treatment is capped at 25 cars. Once a car actually starts, Singer quotes roughly 10 months and about 4,000 hours of work, so the queue, and not the build, accounts for most of the calendar. Nearly 500 cars have been delivered since 2009 per Road & Track, and the 300th Classic was completed in February 2024 per Popular Science. The May 2025 Carrera Coupe Reimagined, also 964-based, opened 100 commissions.
Two risks deserve attention before a commission or a resale. First, Porsche intellectual property: the ACS name was scrubbed in 2021 after a Porsche trademark objection, and a 2024 suit was filed and then dismissed. Second, the donor question, since every car consumes a 1989 to 1994 Type 964 from a finite pool, which remains a live controversy among owners. There is no OEM service network behind these cars, and one Rennlist owner account describes HVAC, cruise control, and drone complaints, a sample of one that should be checked on inspection and not assumed as a pattern.
How it evolved
2009
Rob Dickinson starts Singer Vehicle Design, restoring and reimagining owner-supplied Type 964 cars from 1989 to 1994. The name honors Porsche race engineer Norbert Singer and Dickinson's own career as a vocalist. The company is not a Porsche-affiliated manufacturer. Motor Trend records the house mantra as Everything is important.
2018
The Dynamics and Lightweighting Study arrives with a naturally aspirated 4.0 liter flat six making about 500 horsepower and revving beyond 9,000 rpm, engineered with Williams Advanced Engineering and with Hans Mezger and Norbert Singer consulting. Production is capped at 75 cars. Car and Driver reported $1.8 million.
2021
The All-Terrain Competition Study name is scrubbed following a Porsche trademark objection, an early marker of the intellectual property friction that follows the company.
2022
A 930 homage on the 964 platform with a twin-turbocharged 3.8 liter flat six and a six-speed manual. Singer's official rating is 510 horsepower; Wikipedia lists 450 or 510 and Top Gear cites both figures. The slant-nose treatment is limited to 25 cars.
June 2023
A 934/5-inspired 964 with a twin-turbocharged 3.8 liter flat six, rated at 710 horsepower SAE net officially and reported elsewhere as roughly 700 plus. Limited to 99 cars.
February 2024
Popular Science reports the 300th Classic commission completed, a useful gauge of how slowly a roughly 4,000 hour build scales.
2024-2025
A 2024 Porsche suit is filed and then dismissed. In May 2025 the Carrera Coupe Reimagined opens 100 commissions, again on the Type 964. Road & Track counts nearly 500 cars delivered since 2009 and states the naturally aspirated Classic is no longer available, while Singer's Classic page still describes it.
What to know
What is special
Every car is a Type 964 from 1989 to 1994, supplied by the client, with the original monocoque retained under carbon panels. The Classic uses a Mezger flat six in 3.6, 3.8, or 4.0 liter form, up to 390 horsepower, with a six-speed manual.
Classic Turbo is the 930 answer: twin-turbocharged 3.8, 510 horsepower in official material, six-speed manual. DLS is the naturally aspirated ceiling at roughly 500 horsepower beyond 9,000 rpm, engineered with Williams Advanced Engineering, 75 cars maximum. DLS Turbo takes the 934/5 route at 710 horsepower SAE net, 99 cars.
Hard caps throughout: 75 DLS, 99 DLS Turbo, 25 slant-nose Classic Turbo, 100 Carrera Coupe Reimagined commissions. About 4,000 hours and roughly 10 months of work per car once the build begins.
What to look at
Wait times: Top Gear reported over 300 Classic Turbo orders and a wait of about three years, while the build itself is only about 10 months once started. Get the queue position and the scheduled start date in writing, and separate waiting time from build time when you plan around delivery.
Classic availability conflict: Road & Track reported in 2025 that the naturally aspirated Classic is no longer available, while Singer's official page still describes the program. Confirm the current status of the specific service with Singer before you buy a donor car intended for that program.
Classic Turbo power conflict: Singer's official figure is 510 hp, Wikipedia lists 450 or 510 hp, and Top Gear cites 450 and 510 hp. Match the figure to the individual commission's documentation instead of relying on a general program number.
Porsche intellectual property history: the ACS name was scrubbed in 2021 after a Porsche trademark objection, and a 2024 Porsche suit was filed and then dismissed. Expect naming and design references to shift over time, and check that any car's documentation uses current terminology.
Service and donor: there is no OEM Porsche service channel. Identify who will service the car before the commission starts. Budget for the donor separately, since both the Top Gear price of about £850,000 for the Classic Turbo and the Road & Track range of $1.1 million to $1.4 million exclude it. One Rennlist owner account describes HVAC, cruise control, and cabin drone issues; treat that as a single data point and exercise those systems on inspection.
The appeal
Classic, Classic Turbo, DLS, and DLS Turbo all start on the Type 964, yet they cover naturally aspirated 390 horsepower through 710 horsepower SAE net. A buyer picks a character, from a street Classic to a 9,000 rpm DLS to a twin-turbo 934/5 tribute, without leaving the same underlying chassis.
Motor Trend records the mantra, and the numbers back it: about 4,000 hours across roughly 10 months per commission, carbon panels over the retained 964 monocoque, and naturally aspirated Mezger power built to order in three displacements.
The caps are hard. 75 DLS, 99 DLS Turbo, 25 slant-nose Classic Turbo, 100 Carrera Coupe Reimagined commissions. Nearly 500 cars total since 2009, with the 300th Classic completed in February 2024.
DLS was developed with Williams Advanced Engineering, with Hans Mezger and Norbert Singer consulting. The naming itself points back to Norbert Singer's Porsche race program, which is the reference point these cars are measured against.
What is it?
Programs
2009-2022
The defining naturally aspirated commission built on client-supplied Type 964 donors. Powered by an air-cooled Mezger flat-six in 3.6, 3.8, or 4.0 liter displacement delivering up to 390 hp through a six-speed manual, clothed in carbon-fiber bodywork over the factory monocoque. Capped after roughly 450 commissions.
2018-
Engineered in collaboration with Williams Advanced Engineering, with Hans Mezger and Norbert Singer consulting. Features a bespoke 4.0-liter four-valve naturally aspirated flat-six producing 500 hp beyond 9,000 rpm, advanced carbon-fiber aero, and magnesium/titanium lightweighting. Limited to 75 numbered commissions.
2022-
Forced-induction homage to the iconic Porsche 930 Turbo, engineered on the Type 964 chassis. Features a Mezger-derived 3.8-liter twin-turbo flat-six rated at 510 hp, rear-wheel or all-wheel drive, and an available slant-nose treatment limited to 25 commissions among over 300 orders.
2023-
IMSA 934/5-inspired endurance racing celebration, pairing the Type 964 monocoque with a 3.8-liter twin-turbocharged flat-six generating 710 hp SAE net. Configurable in track-focused high-downforce or road-oriented aerodynamic packages, capped at 99 commissions.
Related
Donor generation for Singer Classic Study, DLS, Turbo Study, and DLS Turbo commissions.
Live listings

Singer Turbo Study born in May 2025, with a 3.8-liter twin-turbo flat-six, 503 hp, six-speed manual, rear-wheel drive, PTS Azzuro Thetys Metallic, Boomerang leather, carbon-fiber bodywork.
257 mimanual
Tatooine commission, Singer Vehicle Design order #174, finished in Blue Blood over Cognac leather with custom weave inserts. Its 4.0L engine, Ohlins suspension, carbon roof, roll hoop, and Singer A and B services are documented.
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Wolf Blue Metallic.
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476 mimanual
Weimaraner Grey Metallic over Monza Onyx.
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Closed listings
Prior appearances GarageScout has attached to this builder beyond the live set.

Singer “Elroy” commission with an Ed Pink 4.0-liter flat-six, paint-to-sample Tangerine Orange over black, and documented hand-crafted construction. Features include Öhlins suspension, Brembo carbon-ceramic brakes, limited-slip differential, and a six-speed manual.
791 mimanual
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The 2019 build was repaired after a 2022 rear-end collision, with salvage-title and mileage discrepancies disclosed.
4,800 mimanual
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1,484 mi
7,821 mi
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