The mighty car mod boys fitted the K3-VE2 102bhp Sirion engine into their Cuore a while ago (bolts straight in)

On this episode they test pod filters vs the standard setup.

Just as I've said before. The manufacturers design a good inlet system.

By the way, If the power seems low. It's not. The dyno is showing power measured at the wheels.(IN Australia and NZ they don't seem to quote estimated flywheel power like we do)