Although I will be building a “turbo motor” I am putting a GT45 ($160 on eBay) onto my stock ‘88 318 with intercooler, Performer intake, Used Holley 750, distributor to convert from TBI, intake and exhaust plumbing, blow-offs and wastgates, I plan to be making about 400whp for $1,500‘ish.
the “turbo motor” I plan for 500-600whp. This will most likely add $1,500-2,000 to the whole job.
That said, I do my own engine building, fab and welding work, and love good used parts from OfferUp and Craigslist, so that for sure keeps costs low.
