I want to do the ettc mod. Has anyone had any bad luck while performing this mod? Also is it easier to just go directly to the ECU, instead of following the instructions on MKIV.com? I am an Electrical Engineer and it seems easy enough to do the mod at the ECU but I wondered why it said "for experienced users you can use the ECU directly" on MKIV.com instructions because it seems easier than trying to find all the right wires under the hood. How hard is it to get to the ECU can someone tell me how to get to it?