Aftermarket ecu.
 

At what stage of tune is it advisable to go aftermarket ecu, link, syvecs ect?

thanks

it doesn't really matter what stage of tune your at buddy, if I wasnt having this big build done I would still have an aftermarket ecu for the extra features.

I would say if your investing alot of money into a new engine then that is the time to have the ecu upgraded so you have all of the safety features looking after your new motor.