RennTech HHT ECU Upgrade 2001-2006 Mercedes-Benz CL 55 AMG C215

The 2001-2006 CL 55 AMG responds well to software, and RennTech has been writing engine calibrations since electronic engine management arrived in the mid-1980s. This HHT ECU Upgrade rewrites ignition timing, throttle mapping, fueling and boost control, so the extra power arrives across the whole rev range without giving up everyday drivability. RennTech rates the CL 55 AMG at up to 370 hp and 410 lb-ft with this upgrade, a gain of 16 hp and 19 lb-ft.

Watch it explained

Features

• Loaded through the RennTech HHT hand-held tuner via the OBD2 port, no ECU removal
• The HHT stores the tuned and the factory file, so you can switch back to stock any time
• Revised ignition timing, throttle mapping, air-fuel ratios and boost control
• Gains across the entire rev range, not just at peak
• Developed on RennTech's own dyno and road tested
• Keeps factory-like drivability and reliability for daily use

What is included

• RennTech calibration for your car
• Delivery as listed by RennTech for this model (HHT tuner or ECU flash)

Specs

Fitment notes

For the CL 55 AMG (C215), 2001-2006 as listed by RennTech. Please include your VIN with the order so RennTech can confirm the exact application. Check the fitment table before ordering, and contact us if your car differs.

Fitment