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Porsche RUF 3800S

Porsche RUF 3800S

Cabriolet, 2005


  • RUF 3800S Conversion by RUF Dallas
  • 3.8L X51 997 Carrera S engine (380+ hp)
  • Cayman GT4 transmission

2005 RUF 3800S – a Boxster S with the heart of a 997 Carrera S and a Cayman GT4 transmission.

This 2005 Boxster S was converted to RUF 3800S specification by RUF AutoCentre in Dallas. The conversion included installation of a 3.8L X51 Flat-6, a full RUF exhaust, RUF ECU programming, 19″ RUF wheels, and RUF badging. In 2021, the stock Boxster S transmission was replaced by a 6-speed unit out of a Cayman GT4 with a new clutch.


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The vehicle in detail

Boxster S converted to 3800S at RUF AutoCentre Dallas.  This car build is rated at 380-400 hp

Conversion included:

  • Installed new Porsche 911 3.8L engine with an X51 power package
  • RUF full exhaust
  • RUF ECU programming
  • RUF 19″ wheels
  • RUF shifter
  • RUF badging
2021 Upgrades:
  • Porsche GT4 six speed gearbox (with approximately 5k miles)
  • New performance clutch installed
  • Convertible top transmission gears
  • Porsche windshield
  • CarPlay stereo headunit
  • CV boots

This RUF is a blast to drive and known by the Dallas locals that facilitated the build.  The GT4 transmission makes it even sweeter to drive, has smooth shifts, and is geared better than the original Boxster S transmission.


Year of construction: 2005
Model: RUF 3800S
Body: Cabriolet
Series: RUF
Mileage: 105000 mi
Power: 400 HP
Cylinder capacity: 3,8 Liter
Steering: left
Transmission: Manual
Drive: Rear drive
Fuel: Gasoline
Interior color: Black
Interior material: Leather
Exterior color: Grey
Manufacturer color code (exterior): Atlasgrau Metallic M7X
Condition: Accident-free
New / used: Used car
Ready to drive: yes
Registered: yes

More information

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Patrick Conner

Patrick Conner from Hey, Cool Car looks forward to your questions and is happy to help you.

Porsche RUF 3800S

Price: USD 49,000

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