the upgrade is about $2300.00 you can call tact usa and ask them. i believe there is now a tact dk or lyngdorf audio in the USA now. you can call them for their price. there is rumor of a mk4 but when i dont know. all i can share with you is the tact gear is good but until its upgraded by the company that did mine the stock gear really sounds mediocre compared to the one i have. this assesment is also the same of one of the reviewers of stereo times who had his unit done after i highly advised him to do so. the upgraded sound of the millenium mk3 actually embarasses the sound of the stock millenium as well as all the other gear that this company has upgraded for me. i wont listen to stock gear anymore. if i get something new it goes right to them after a quick listen. the improvements are not subtle especially after the units break in.
