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I did water/meths injection on my 1987 Honda Civic (1300cc non-injection) - I placed a 0.5mm spacer plate between block & head.

Then I placed a Garret turbo (T04 type) with waste gate & 2.5 inch SU carb - the carb had a copper tube with a swaged end, then a small drill hole placed in the tube to squirt water/meths to air inlet side of carb, had it set for 20lb boost with water injection, the water injection was a simple window washer bottle that was turned on with an adjustable pressure switch from the inlet manifold - I used this setup for 12 years (with only one engine / turbo rebuild - after 240,000 kms) - had the car for over 15 years before I sold it to a local Honda mechanic....