All EX Lancer Turbos and GSRs have SOHC engines... G63BT (2000) and G62BT (1800.)
SOHC with the world's 1st EFI system (electronic fuel injection) bigger front (ventilated) AND rear disk brakes... rear LSD (option)... black w/grey striped Recaro seats for 1800 GSR (JDM.)
AFAIK the only carburetted EX Lancer GSRs (Gen II) was the 1600 GSR...
also SOHC with twin side-draft Mikunis (spelling?) smaller front disk brakes/ rear drums.
These should help too...
Lancer EX Turbo 2000: 168 bhp (non-intercooled) / 177 bhp (intercooled.)
Link--> EX BROCHURE Part #1: Lancer 2000 Turbo.
Lancer EX 1800 GSR (JDM): 159 bhp (intercooled.)
Link--> EX BROCHURE Part #2: Lancer 1800 GSR.