We carried out a DPF removal on a 4 year old Merc 320 CDI today and initially installed a DPF delete only map into the ECU.

We rolled the car on our dyno for about 10 minutes to help clean the exhaust and i then drove it hard for about 15 motorway miles before taking it to our local MOT station. The vehicles emissions were tested at only 60 degrees as it had been left to cool down, it passed the test no problem after only 3 revs with an average of 1.41.

We then installed a performance map with an estimated increase of about 40 BHP, we didn't check it on our dyno but it felt about 40 horse. The same emissions test was repeated but this time 5 revs were requested before it also passed at 1.43.

Had this been a real test the vehicle would have passed as visually the DPF can looked standard and the exhaust opacity fell within limits.

Less CO2, more MPG, no engine oil dilution, better driveability and happy customer whilst still within legal emissions limits, your comments please Ed.

Eddie Zyla
CRD Performance.com
Bolton.