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Supported Vehicles:

  • 2001-2005 Porsche 911 (996) Turbo MT WM
  • 2001-2005 Porsche 911 (996) Turbo AT WM
  • 2005 Porsche 911 (996) Turbo S MT WM
  • 2005 Porsche 911 (996) Turbo S AT WM
  • 2002-2005 Porsche 911 (996) Turbo X50 MT WM
  • 2002-2005 Porsche 911 (996) Turbo X50 AT WM
  • 2001-2005 Porsche 911 (996) GT2 MT WM

Current Map Revision: 

911 (996) Turbo911 (996) Turbo S, Turbo X50, GT2
Stage1 v102Stage1 v102Stage2 v102NA
Stage0 v102Stage0 v102
Valet Mode v102Valet Mode v102

Required Accessport Firmware: 

Map Availability: 

Fuel Requirements:

Each map lists the minimum required octane. A higher octane fuel can be used safely on a map designed for lower octane. DO NOT use maps designed for higher octane with lower octane fuels. Top Tier gasoline should be used where available.

  • Maps designated with "93" are for use with 93 and 94 octane/98 RON fuel or better.
  • Maps designated with "91" are for use with 91 and 92 octane/95 RON fuel or better.
  • Maps designated with "ACN91" are for use with 91 octane fuel found in Arizona, California, and Nevada or better.

These maps are designed for E10 fuel (fuel with 10% ethanol content). For those who only have access to E0 fuel (fuel with 0% ethanol) it is recommended to use the "91" and "ACN91" octane versions of the maps and datalog the car to ensure your fuel is performing to the necessary level. This is especially important for those using Canadian 94 octane E0 fuel. 


Typical Stage2 tuned gains vs Stock Power: (all graphs shown are on the same car using Stage2 hardware)

MapPeak Gains*Largest Gain*Stage2 ACN91 

+12% HP / +14% TQ 

+18% HP / +18% TQ 

Stage2 91 

+15% HP / +15% TQ 

+20% HP / +20% TQ 

Stage2 93 

+21% HP / +18% TQ+30% HP / +30% TQ
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Stage2 93  HP TQ

Stage2 91  HP TQ


Stage2 ACN91 HP TQ

Stage2 factory tune HP TQ

Stage 1

  • Exhaust Requirements: Stock
  • Intake Requirements: Stock air box with stock air filter 
  • Intercooler Requirements: Stock or Upgraded intercooler (Recommended)
  • Boost Targets: 15psi (+/- 1.5PSI) 

Stage 2

  • Exhaust Requirements: After-Market Exhaust System
    • High Flow Exhaust (larger diameter piping)
    • High flow catalytic converters.
  • Intake Requirements: Stock airbox with stock air filter or upgraded panel filter. 
  • Intercooler Requirements: Stock or Upgraded intercooler (Recommended)

  • Boost Targets: 15 PSI (+/- 1.5PSI) 
    • NOTE: Stock and OTS maps are not compatible with iPE Exhaust systems.

Notes: Stage 1 and Stage 2 OTS maps have brake boosting enabled for 2 seconds. You will be able to floor the gas with your foot on the brake to build boost. Use this with caution as it can damage brakes if done for extended periods of time.

The additions of any other hardware may cause the vehicle to perform poorly. If you experience any issues at all please contact COBB Customer Support via 

Peak Gains are measured as the absolute maximum value between the highest points of two plots.
Max. Gains are measured as the average maximum value between the highest and lowest point of two plots.

Results may vary. Power as tested on 2008 Porsche 911 Turbo (ACN91 octane fuel).

Non Performance Maps

Valet Mode

  • Rev limiter set to 4500 RPM.

Stage 0 

  • Stock calibration (does not uninstall Accessport from vehicle). 

Closing Warnings and Precautions:

  • Use of inappropriate calibration/modification combinations will promote engine damage.
  • Seek the help of a professional COBB Protuner should your Porsche Turbo fall outside of OTS map requirements.
  • Top Tier gasoline should be used when available. Use of lower quality fuels can result in catastrophic engine damage.For track events, we recommend using at least 2 gallons of 100 octane fuel to battle high track temperatures.

Revision Notes:


  • Maps have been updated to eliminate unnecessary DTC suppression


  • Map maintenance update for future feature support.


  • Adjusted load correction, load and torque limits, raised vehicle rev limits, raised vehicle speed limits, and enabled brake boosting for 2 seconds. Fuel and ignition timing have been optimized appropriately for their gas type.