The difference between Delphi OE & Delphi aftermarket is:
Delphi OE coil pack is made the specification that the O.E. manufacturer gives to Delphi ....
Delphi aftermarket coil pack is made to the specification that Delphi decide is a suitable & adequate replacement for vehicle in question ....
Same applies to the spark plug question Rob ..
Just because Bosch list a plug for a particular Vauxhall .. dont mean it's EXACTLY the same spec as the O.E. plug ......
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