hi op
i dont want to piss on your parade but surely an m45 is not going to give you any meaningful gains, from some threads i have read on club gti an m45 on a 4cyl vw is not enough to produce any real significant gains.
the recommendations have been to go for an m62 on a vw 1.8 4 cyl, with a 5 pot audi surely you would need at least an m62 to flow enough air to feed a 5 pot?