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You could put a stock 20b with its twins tuned to make 300-310 whp for about $15-20,000. Going to a 20b with a single turbo is going to cost at least $35,000 done well. (It can and has cost people $50-75,000 and possibly more to do what they wanted with a 20b single...) I have a 20b NA and a 20b GT42R and have some idea what it takes to do these.
Knowing what the parts cost doesn't mean anything at all and I wouldn't listen to anyone who tells you that $30,000 is f'ng ridiculous. They either have no idea what they're talking about or are planning to rip you off.
If you are anywhere near Ohio, Logan at Defined Motorwerks is your guy, imho. If you are further east, Dave at KD Rotary does a great job. If you are close to Florida, Jesus Padilla is the guy. Those are the only guys I know to recommend, but others can chime in from other parts of the country.
Gordon
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1993 Rx7 R1 20b NA
1994 Rx7 20b supercharged project
1991 BMW 850 6 speed
1991 BMW E30 M3 Evo II
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