I have a Z280.I have run the b6hs ngk plug and it's good.So I was just looking at the local O'Reilly's auto to see if they had a resistor plug,because it interfere with my speedometer and I came across this plug BR6Hix Iridium.I not for sure it will work because all of the NGK Iridium plugs that's talked about on here is bpr6hix and SBP sells the bpr6hix not the br6hix.So would like to know the difference?