My 1.8 was a fantasic engine and quite quick it had a decat and the exhaust only had one middle box on it with a pipe to the rear and a home made induction kit
I know that the MK1 1.8 HLX had a different Throttle Body and intake system and had an ABS system which ran on Spigot rings... where as the Later MK2 had ABS\EBD which was electronic\magnetic the TB and intake was also different...