Would it be 10k more awesome than a 400 BHP one.
Expect a reliable 400BHP KO4 S3 very soon
Expect a reliable 500BHP 2.5TFSi RS3 yesterday
The stage 1 RS3 was bloody impressive, nothing OEM this side of a muircielago would keep with it, went around corners too.
So back on topic
I'd rather have a 23k plus 4k tuning budget to get to 400BHP than a 23k car and a £10k spend to get to 500 BHP.
In addition the 400 BHP could be done pretty much in an afternoon