Taken this a bit the wrong way mate,
Ok so people would rather have a S3 with a big turbo build than a Ł20k s4 powered s3.
As you have said. each to their own and as been said by others a monster build S3 reataining the all be it stroked BAM block and a single turbo with handeling mods and brakes would still give you change,
Not to have a go but out of intrest, What MPG does this car return on normal drives? Does it understeer like An "normal " S3?