2 gen trialing plugs (why do they have no slits)
 

I just bought 2 bur7eq's to use as leading plugs and 2 br9eq-14's to use as trailing. But the trailing plugs do not have 4 slits in them (and they say sd11a on them not br9eq-14). My leading plugs have the 4 slits.

I have seen these plugs with no slits before (they also have a T on them), but I was just wondering if they perform the same as the ones that have slits in them.

Thanks.

Those would like Nippondenso plugs and not NGK. Wow...

they are NGK's, and I have seen them in my friends second gen before.

My 2nd gen are NGK's and they are exactly like that, and so are the cosmo ones :)