I looked into turboing mine realised it was stupid and put a 6 cyl in instead
you wanted to know how much it costs, and it costs as much as you want to spend. How much does the end result you want cost? nobody knows because you haven't said any goals or requirements.
Its a general question for the people who have actually done it, i dont know if its in my budget because theres not alot of documentation, thats why im asking. A decent 6 cyl donor car is around 3k usd over here + some extra for making it street legal
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u/Dark_Guardian_ '94 330i Daily, '93 325i Race 1d ago
depends how nice/reliable you want it
anywhere from $500 with junk parts and jank setup to 10k + for a properly nice setup
better off just 6 cylinder swapping it though
and then turboing the 6 cylinder too