right, well i had one of those eko-tek things on my 1.3 mk2 and after maybe a month i was getting more miles out of the tank better low end response and emissions for mot were much lower. i even had better mpg even tho i ran a straight through from 1st box to gti rear box, and a bloke at work got one on mk3 driver and says pick up much better and more mpg on longer distance drives. if thats any help.