Originally Posted by nytaurean
I purchased 30 GRP Plugs from The Border online last season and they are absolute garbage. They seam to be GRP Fakes. They came in zip lock bags unlike the original GRP plastic cases all the plugs usually come in. They do not last and will lose the filament and scratch your piston up very badly.
I contacted The Border about the authenticity of these plugs and of course they denied it, but please do yourself a favor and only purchase these plugs from someone you can trust.
To be honest, GRP does actually use zip lock bags for their plugs, they do not make the boxes anymore. But I can not imagine they were rubbish because my friend has bought and sold hundreds of them en is using them by himself without any issues.
The only thing I can imagine is using the wrong plug number, take a look into the Technopower topic on this (offroad) forum, there is something mentioned about other specs to a plugnumber.