Hello MSF, I have HKS turbo timer that friend gave to me but he said that in order to install it, I need a Mazdaspeed harness for it to work. Do you people know what part of harness he is talking about? Thanks for the answer
And no harness needed. You have to find and tap the ignition wires accordingly. That said, nobody really uses em in speeds 2006-2013. Not really needed. Plus idling for 30 seconds or so after a bear down driving is nothing.