This is the best upgrade you can make to your Audi TT. Forget it...buy and make your own. Be sure to label your signal wires (#3 on each spool) and group all of your grounds coming from your car into the four connector slots. Do the same with the power wires and group them into the four sockets of the connector. The signal lines go into the first four slots (coils 1 to 4) respectively, underneath there are four power lines. The last four slots are your lands. Two in the top row, two in the bottom row. You will have no problems with ignition coils (misfires) for years!
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