does anyone know why the sparkplugs on a 3.4l v6 4runner use diff plugs nkg BKR5EKB-11 and denso K16TR11 on each side. I checked with the local parts store and they sold me NKG5EGP plugs these are not twin grounded, online this plug states its compatible... my owners manual says to only use the NKG5EKB-11 and K16TR11 any ideas if this is ok... thanks

 

pruchased factory plugs from dealer, cost a little more, so wasn't worth the worries of any problems at higher speeds....