Car with power potential by 800€

Hello community, I’m looking for a car up to +-8000€ and would like to do something about the engine later on still performance-wise (chip, downpipe, possibly exhaust system and LLK). Age doesn’t matter and displacement should not necessarily be over 2,000cc and so up to 160-230Ps series. I would plug in as much as 250€ and would be nice if it were then a low 6s to 5,5s time from 0-100. And it should already be a turbo engine from home. Had so on 1.8t`s and 2.0 with K03/K04 Loader thought of by VW Group but also with Japanese I am not averse. Grade with older like Nissan 200SX etc. Otherwise the rest doesn’t matter…the overall package must fit. MFG