Spark plug NGK or OEM Mazda

good plugs, cheap, and I get zero misfires at 0.028\" gap on a chipped K03 Sport.

They work beautifully. I've been using them for the past 24,000 miles. I change them every oil change (hey, they're cheap) and they seem to be the smoothest that i'v tried.

28R, NGKBKR7Es - 0.028" Change every 8K miles. Only $2.30 a piece, and I run lots of race fuel

using the BKR7E for the past 6 months without problems.

Spark Plug Gap - Measuring and Adjusting NGK - BKR5EKUP

My personal preference is NGK's, I run em in everything I've ever owned. They seem more reliable, and last longer.

my 570+whp civic buddy terry couldnt get past 574whp... the plugs he was running, bkr7e race plug, had alittle brown speckle and melted the number 3 plug. after letting the car cool down for 30 mins or so, instead of retarding timing to run more boost he slaped in a set of ngk r5672a-9 plugs... and upped the boost 2psi from 27psi to 29psi... and BAM!!!!! 616whp.

Same plugs I'm currently running - used them with my Jacobs ignition, and they work like a champ.....

NGK v-power's. they are the entry level plug but they work awesome. there's no real need to get super pimp plugs though, i mean, it's not like they are going to add 10hp or anything

I was running the junky ford plugs with little to no issues and switched to those NGKs and now I will actually foul a plug in warmup. This has never happened before and I would venture to say they are my least favorite plugs at this time. I have never had these issues until the NGKs.