Leave it l. The torque rules on the hill climbs

over the years I had to agree the L has all the goodies.

If the the car is running and driving leave the L20 in there and just do the brakes suspension upgrades. After that get the safety gear in it. Going racing involves a lot of little jobs and will test most folks dedication, so the less you need to do to get to your first event the better.

Tom

If you will formally compete, You have to build to fit their rules. That will make some of the decisions for you.

The power comes from boost presure, rpm and engine displacement.
Always cheaper(easier too) to begin with an engine with good power...even a Hyabusa engine is a possibility (200 hp with lots of rpm )chain drive (higher efficiency from that).

The first time I heard a motorcycle engined car I thought "I don't hear many cars like that except all out race cars, he's got a really hot engine in it." but it was a 1 liter motorcycle engine from a sport bike. They don't require any engine development on your part. Its a much cheaper way to get a high performance engine.