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The rule of thumb for Bosch Platinum plugs is: Take a hammer to them, throw them in the garbage, and then get some decent spark plugs. The QC on them is lousy; they like to foul and the little tiny speck of platinum likes to fall out of the plug. And I know at least one friend who blames the loss of an engine to the ceramic electrode breaking up inside the cylinder and scoring the cylinder wall badly.
The "+4" and "+2" plugs are the same junky cheap platinum plugs with one or three extra outer electrodes added on. They're still crap IMHO.
Bosch actually does make good platinum plugs, but they're quite expensive and not usually something you'll find in a normal parts store. Their silver and copper plugs are just fine, in my experience.
As are NGKs and most other decent quality brands; I have yet to have a problem with an NGK plug in my CRX.
Those "pulse" plugs appear to be very expensive plugs that perform about the same as regular plugs.
-soD
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