I have a 2004 TSX and one of my ballast went bad. Can I replace the stock system for an aftermarket HID kit? Will it plug and play just as a regular car without stock HID would?

 

Aftermarket HIDs will not be a direct plug and play. It will be difficult to seal the headlight properly if you're using a aftermarket HID ballast since the OEM ballast is mounted right underneath the headlight. Stick with OEM ballasts.

 

This is probably your best bet. Could you replace with aftermarket? Sure...but I think staying OEM would be your best bet. I have aftermarkets in my fogs, but will stay OEM in the headlights. Less hassle that way imo.