Ive got the iat trick in my car.But mine is setup alittle differant.The guys at cartek>>>>>>>told me about it.Its pretty simple and you have normal timing until you decide to flip the switch and it pulls timing according to the resistor installed in the line.So if you use different size resistors it'll pull different about of timing .It uses a double pull/double throw switch (that you can get at radio shack cheap)thats hooked up to your nitrious arming switch.So like I said when you flip the switch the timing gets pulled and your ready to spray.You'll have to call cartek>>>> for details cause I lost my diagram to show you how to do.