The Institute comprises 33 Full and 14 Associate Members, with 16 Affiliate Members from departments within the University of Cape Town, and 17 Adjunct Members based nationally or internationally. Associate membership to the IDM is for up-and-coming researchers fully committed to conducting their research in the IDM, who fulfill certain criteria, for 3-year terms, which are renewable. Subaru's EJ251 and EJ252 were 2.5-litre horizontally-opposed (or 'boxer') four-cylinder petrol engines. For Australia, the EJ251 engine was first introduced in the Subaru BE/BH Liberty in 1998 and subsequently offered in the BH Outback, GD/GG Impreza RS and Subaru SG Forester. For the Subaru BL/BP Liberty and BP Outback, the EJ251 was replaced by the EJ252 engine.