If you have the Bosch 4+ do you need to check the gap, cause I figure with four tips.. there should be some good spark.

 

On the Bosch +4, gapping is never required. Factory gapped and they never have to be touched again, unless the wear out of course.

 

i'm not really sold on these multi-electrode spark plugs. electricity will always take the path of least resistance, so there i a good chance that the spark will always go the same way, negating the need for other electrodes.

 

i use the cheapest simplist NGK plugs they sell, and toss them every 10K.

scrapping a $2 plug feels better than scrapping a $12 plug. plus Iridium, and platinum plugs give more life, not nessasarily better spark.

I tried the Denso duel prong plugs, I tried the +4, and ive tried the Iridium NGK's, i felt no difference at all in the performance.