Technically, this is a "thin-wall" big bore kit for the standard 1600cc VW engine. pistons/cylinders. 1641cc: pistons/cylinders.

thin-wall cylinders are perfectly safe for street driving, commuting, and touring.

Something like an Engle W100 for better torque.

It uses the same diameter cylinder base as a stock 1600, meaning it fits into standard heads and engine cases.

Piston and cylinder kits are widely available and very affordable.