First came the cat. It was hailed as being the solution to the environmental problems cars would cause. What did the cat really do? It prevented the lean burn concept taking of and lu,bered us with higher fuel consumption.. It was claimed theat the CO and the HC output as well as the nitrous oxide emission would be so harmful and kill our planet. Hmm. Why then did weeds and grass thrive along motorways more than anywhere else? And what they don't tell us till date is that the cat produces H2SO3. Not some nice stuff. Even worse is that the cat produces cyanide. Take all the cars on the planet that have a cat and collect the cyanide they produce annually and you can kill in excess of 10 crore adults instantly. Nice way of slow poisoning. And there s more to the cat. 5-8% increased fuel consumption means that you have to pay for every 20 tank loads another basically for the luxury of having an 'environmentally friendly' trap attached to your car. Well, that can't be all the industires is lumbering us with. Of course, it can't be. Such a thought would be insame. The industries had to act. We blessed us with another contraption. The Diesel powered cars got a DPF. What actually does the DPF do. Well, it collectes particules that are not burnt in a filter, which loses the engine more power as km are clocked up and when the ECU decides it is enough, lots of fuel will be thrown to the filter and the whole rubbish will be burnt out. Why on earth do they not burn it in the combustion chamber? Because it would mean engineers have to wreck their brains. And this costs money and money must not be spent. Removing the DPF instantly gains power and saves fuel. The fuel saved is between 5 and 10%. Additionally re-mapping can save between 5 and 15%. This is a worthwhile improvement. It is good for the economy and the environment. BTW, removing the DPF is not very difficult and deleting of the ECU setting in order to prevent that the ECU kicks up a fuss is not too hard too. If you can't sort it and want it to be sorted, feel free to contact me.