My engine is a A15, not an A12, running 79mm pistons at around 12:1 compression with 45mm throttle bodies running on 98 pump fuel. I built the engine myself so I'm not sure how much it would cost to get it done by a workshop. I probably spent around about $1000 on engine bits and machining that i couldn't do myself (mainly crank balancing), plus probably close to $2000 on the computer and fuel system to run the injection. The dyno I used is an old water retarded one so i'm not sure how accurate it is. I've seen Chris Petersens' racecar rattle off an easy 120-125 at the wheels on the same dyno, which has basically the same setup as my car, aside from some baffling in the sump which I don't have.