i got a 98 civic ex 2dr, and i just bought the haynes manual for it. its kinda vague but for chassis and engine codes it lists that the EJ7=2dr/D16Y5 which is also listed as having the vtec-e (e meaning "enhanced performance") and the EJ8=3 or 4 door as having the D16Y8 which is the regular vtec. on this site under engine codes it lists the D16Y5 as the Hx engine, so why would they give the "enhanced performance" to the HX and not the EX? can someone please explain the difference to me?