Subaru's variable valve timing system, which alters the phasing of the inlet cams hydraulically - as used on some STi turbo's and Japanese spec Legacy Lancaster 2.5 quad cam models (-1999) Bellhousing – a term for a removable housing around the clutch on a manual gearbox, around the torque converter on an automatic gearbox, or around the flywheel / torque converter drive plate on an engine. Typically a casting, vaguely bell shaped. Starter motors are often attached to the bellhousing, on the transmission side in both VW and Subaru terms. Boxer – Subaru's overhead cam engine, first fitted in 1990, was called ‘Boxer' by Subaru (confusing as all their horizontally opposed engines are ‘boxer' engines – it's a generic term for horizontally opposed).