psytropic

are these worth a damn? (when they do actually come out for the Z's motor)

Peking

iTrader: (2)

WTF, wrong section

Ztalker

i'd keep the oem plugs. The dealer would blame it on the plugs and void your powertrain warranty, trust me.

Q45tech

Over the years I have seen serious problems with the +4 on Nissans......any knock can cause an electrode to break off and score the piston and cylinder wall..........seen this 6 times on Q45 and 4 times on older 300zx.

Stick with oems as nothing will create more power or last as long.
The extremely high voltage from coil on plug ignition requires you to match plugs to the oem design.

chimmike

iTrader: (7)

overall the bosch +4s are absolute crap

bosch plugs in general are crap. Stick with NGK

blasian

iTrader: (29)

+1

I have NGK Iridium plugs and have no problem with them.

sq40

iTrader: (4)

BIG BIG BIG +1 Bosch just seems to make **** anymore. NGK, even their Cheaper V-Power Plugs are Excellent!

Q45tech

Everything extra [electrodes] you put in combustion chamber has a way of restricting the flame front from it's designed dispersion shape and rate..........just another thing to allow spark knock to begin.

FORZWIN

iTrader: (4)

I'll take the cheapest denso's over those overpriced pieces of junk anyday, and I have agian and again.

I fouled two of them in 3 weeks, went back to the el cheapo denso and ran them forever.

SpeedRcr

iTrader: (5)

iridiums all the way...