Originally Posted by mechanic28

be careful bud we(vauxhall) can tell if the software has been changed in fact we are instructed to check now for warranty claims regarding engines/transmissions etc!although that is just on the vxr range that we have had to check atm!

Of course this is not to say its not worth while in terms of power and fuelling gains etc!jsut a view from a main dealers poitn of veiw!