I am in Australia and have the same issues. We replaced the whole exhaust system with stainless headers, new mufflers and larger diameter pipe and acheived the increase in performance we were after. We then had the same issue with the VSC light coming on with no cats installed so we then installed high flow cats and unfortunately still the same issue. Installing the original cats will fix the problem but then it will also delete the performance gains acheived by installing the sytem and high flows. The error can be easily reset but lasts for about a day then comes on again.
Woud love an answer to the problem as besides the lights being very annoying when driving, having the VSC work again when my wife is driving would be great. I love it not working though is it is awesome fun to drive sideways!!!
Any advice or help appreciated.
