Sti motor and tranny

04 05 SUBARU STi VERSION 8 ENGINE WITH 6 SPEED DCCD TRANSMISSION JDM EJ20T. Subaru EJ engine - Wikipedia. The limited-production S variant cranks that up to hp and lb-ft, which is no small feat but also likely the most that Subaru is able to reliably extract from the aging engine architecture, which was first introduced in the mid-'90s, without things going "kaboom" or impacting streetable engine response.