USDM:
S = F22A SOHC, 135hp. No OEM front lip.
Si = H23A DOHC, 160hp.
Si-4WS = H23A DOHC, 160hp. Addition of Electronic 4WS system.
SE = H23A DOHC, 160hp. Tan leather interior, gold badging.
Si-VTEC = H22A DOHC, 190hp. Shorter gearing, stock spoiler with LED brakelight.
CANADA:
S = same as USDM S model.
SR = same as USDM Si model.
SR-4WS = same as USDM Si-4WS model.
SR-V = same as USDM Si-VTEC model.
big thing with Canadian models is that they have heated seats