dorie Bosch are the best ,.But you need to make sure they are genuine Bosch plugs .I have had a set of HT leads that turned out to be fake .I contacted Bosch and i was told that a lot of items made in china are finding their way in to the parts chain . And that Bosch items will have a genuine hologram on the product lables, and boxes. I do like Beru electrical parts and would take them both if need be ...You can google the genuine bosch sales logo .