ive seen badges on astras and corsa
what it mean/do?
basically an updated version of each respective single port engine....
Have a read of this for some gen: http://en.wikipedia.org/wiki/GM_Family_1_engine
FYI: Twinport variants have the addition of the letter "P" on the engine code to detemine twinport status...
for instance Z12XE becomes Z12XEP, Z14XE becomes Z14XEP & Z16XE becomes Z16XEP
If this aint enough info for ya - then do a search as its been covered a few times now.
Originally Posted by Wikipedia