I have had my wonderful gt86 aero since February I brought her brand new since I've had her I have invested in a milltek full non resonated exhaust system and put a k&n air box filter in her I've heard that cosworth do a upgrade stage one prior to supercharging which includes map thermostat, filter can I use this off of my existing filter/ exhaust also where do I go next with the mods guys
any suggestions will be appreciated