Best spark plug for e30?

[digger]

CR=compression ratio correct?

the CR means compression ratio.

BPR6ES is the p/n for ngk but only for a higher compression engine the stock ngk is fine for stock engine

[AlexHale]

CR=compression ratio correct?

[QUKBMER]

Your using a standard ngk spark plug part #BPR6ES or CR BPR6ES?

[digger]

use NGK over bosch no fancy shit though, and on M20 with upper CR BPR6ES which is one range cooler.

[AlexHale]

Dude I know! I just didn't know if using a maf and bigger injectors will make a difference, will it?

[dnguyen1963]

Really old topic! Do us a favor and use the search function.

[AlexHale]

Any preference Bosch vs ngk vs denzo? Copper core vs 4 tip blood diamond plated blinders? Seriously, which is the best plug on a internally stick motor with MAF and 19lbs( if that matters, didn't know if it'd change heat range...idk). Thanks for any relies.