From 2002 on wards, a Defender ECU can be directly remapped to give better performance and economy.  
 

​Benefits of upgrading the ECU Map include:

• Increased horsepower
• Increased torque
• Better throttle response
• Smoother power delivery
• Improved fuel economy
• Safer overtaking​

Pre 2002 TD5's can still be remapped but this involves removing the ECU.

Puma 2.2 & 2.4 TDCi 
Original BHP: 122
Tuned BHP: 150

Original Torque: 360
Tuned Torque: 420

BHP Increase: 23%
Torque Increase: 17%

​From £345 + VAT

2002-2007 TD5
Original BHP: 122
Tuned BHP: 150

Original Torque: 300
Tuned Torque: 365

BHP Increase: 23%
Torque Increase: 22%

From £345 + vat
​