here we go again....got rid of the other chip that i had bought(guy gave me my money back) got one of off ebay...yes yes i know guy reckons it was a collins 190 chip i opened it up today sure enough the chip don't look standard it has like a piggy back chip on it just wondering are these chips bad for going wrong?i installed the chip and -31 was getting up to aprox 15 psi and car was poping/banging...yes i realise i need to get the car set up but as described in a earlier post i had the car up to a local tuner when i tried to fit the other chip he turned up the fuelling a touch (it was about 2% lamda reading if that is of any importance) so i thought the car was basically ready for another chip to go in is this correct or wrong