Im sure this may be old news to most but i recently read some people amazed at the concept of a twin turbo 4.2. but its already been done by Gumpert, in the Apollo. though not an audi the car was on the top of top gears list, last year, but it does use audis 4.2L motor with obviously much modification, it makes me wonder how much power u could get out of the standard audi 4.2 with just a few modifications and twin turbos.
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