If starting with a stock TT car, you want 740cc injectors and a tune to give it the additional fuel. Some are running the stock TT fuel pump with stock turbos. I did that for awhile, but soon switched to a Walbro 485 to be sure that the stock fuel pump was not a problem. I'm running new (last 8 years or so) Nissan fuel line. Not really because I switched to E85, but because the old lines in the engine compartment were old and had been subjected to a lot of heat. Aromatics in "pure gas" will harm your fuel components more than ethanol.
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