Up to around 440lbs,the DSG clutch is OK,but above that,will need a rebuild,and either SSP,or HPA can supply these,but neither are cheap options.
In all,for a decent Stg3(i.e. big turbo build) you're looking at around £4-6k for the kit(more if you select the APR kit,but that does include everything,and is a direct fit,where some of the others,such as mine,are not so easy),and then a good bit more for other parts and labour.
You also need the brakes and suspension sorted,so in all, you'd be looking at the thick end of £10k for everything,and maybe more if you want to go beyond 440bhp and 440lbs,as you then need at least a bottom end rebuild.
My thread should help give you an idea of costs and so on,and Decked's is a good one for the APR kit.