hi guys i have a gu3 3l td and have installed a tunit chip i bought off a forum . it has definatly improved the performance but i was wondering what the chip should be set at. it is currently set at number 4 . the bloke i bought the chip from had it set at four but he had it in a gu 2 with no mods. I have done egr block mod dawes valve . is this the right setting on the chip for my car. cheers