Havent heard of that but I once installed them in a modified 91 240SX and the car immediately started running like **it. Misfiring and hesitating. Put NGKs in and it ran great. I think they have the right idea but poor QC. Ive heard of others having similar problems
I got sucked into those POS's about 8 years ago. Tried them on my turbo car and burned the ground strap (the fork part of it) right off in the first week and a half. Knocked the ring lands off a piston too.
Put NGK's back in, and it drove perfect for the next 30K miles.
I don't know what they're called, They have 4 prongs and they look really pretty... Also, at $6 a piece they better make my NA run like a stroker. Anyone tried these? A buddy of mine with a new avenger says he noticed a positive difference immediately.