blue is 8mm
if you want another color... youll end up getting 8.5mm red race spec
8.5 are too big so you might need to get custom holders for them
plus unless your engine is extremely modified you wont need them
i went with the ngks over the bosch
NGK BKR 6 EK
got them for about $2.50 a pop at pepboys
there is a higher powered version of the ngk which is used on the M models I believe but those cost significantly more, plus I don't think there is a big need for them on the M44 __________________
318Ti Sport (Gone, but thanks for your years of service) | M3 E30 | 190E-16V | M Coupe E36/8 |