I replaced 5MT WRX box, 4.5kg flywheel and 3200lb springs in MY99 with standard near new 6MT STI package last year (3rd gear in original box broke).

The 6MT clutch seems to be slipping as I get a smell of burnt clutch when I give some stick. I also miss the responsiveness of a light flywheel.

The 6MT is a direct bolt-on to the EJ20. I'm advised that 5MT clutch + flywheel will work in the 6MT provided that the starter motor for 5MT is used.

Can anyone confirm this, or better still, know anyone who has done it?

Cheers