Yes the manifold is a direct swap. How do i know? because i have owned 2 acclaims and 3 mk1 civic's and have played with the EB1, EB3 and EN4 engines. The mk1 civic also has its thermostat built into the inlet manifold like the acclaim has, this is why i have designed my conversion with a remote thermostat. Its still in development in terms of a proper plenum and filter but after a few hours of dyno time the hot/cold starts, acceleration, deceleration and partial throttle transitions are 100% perfect. The conversion works very well