email you? didn't bother to search... <sigh>
short answer. different turbo needs a tune. Buy the turbo the car came with because you clearly aren't really caring that much about it - want to save money, buy it second hand. 'Went to shit'? define that, might mean your engine is filled with the 'shit' - any replacement turbo will soon die from that shit. kthxbi.
search... ALL the answers ARE here on this forum.