i m gonna do my duramax myself so i m seeing what brand i should go with gonna do them this spring
I'd go Bosch.
Wellman, only ones with a warrant and made in Indiana.
http://www.wellmanautomotive.com/glowplugs.php
the guys on diesel place forums are always preaching Bosch but idk what the warranty is on those, if there even is one. I need to change mine before next winter