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hi, well its a little bit difficult to answer, but i'll try
First I had the ts2 kit installed at ESS - total cost was 6000 Euro
Then my cylinder 5 broke - turned out that the company that did my 3.0 conversion lied - they said they had changed the pistons from 323i to 330i pistons but they had not. Instead they had ground them down reducing their thickness... nice job!
So the car went back to ESS - complete engine overhaul in preparation for TS 3 (far beyond what you need for TS 3, new block, new vanos,pistons,exhaust "holes" enlarged, etc.) - total cost 10000 euro
A better indicator is probably to ask maxnathan - he took a 330 ci to ESS and had them do the conversion without any "problems" induced by other tuning companies.
I hope it was helpfull - please feel free to ask further questions if you want