Bosch Platinum +2 VS. Bosch Platinum +4

['94firebirdv6]

from what ive heard, plain old copper plugs are the best but they need replacement more frequently than say platinum so people w/ stcok cars usually run the plat plugs

[navyblue2000]

This has been discussed FAR too many times...

+4's are for LONGEVITY only, and they don't do anything for PERFORMANCE, unless it decreases it.

It arcs to only one tip, true. BUT, it causes the other tips to heat up, and this can tend to cause spark knock, thus kicking in KR, which is BAD BAD BAD for performance.

I myself actually used bosch super(craps). THe combustion chamber on the V6's already gets fairly hot, hot enough to heat soak upward, it doesn't need platinum (which burns hotter in the same heat range as copper) heating it up any more, let alone 3 extra spark tips.