I recently went in to buy a couple new plugs for my 2001 Tohatsu M15D2 and ran into the NGK rep who often visits Marinas in the area. As I told the parts guy that I wanted two NGK BR7HS-10 plugs, the rep commented that I'd get better performance over a wider rpm range using BPR7HS-10 plugs. When I asked him why, he replied that the "projected tip" puts the spark further out into the mixture where it more easily burns the entire fuel charge and does it more consistently. He said a lot more ... most of which made sense (sounded good), but now I'm confused. I admit that his theory is correct, but the "P" tip extends about 1/8 or a bit more than the standard plug. I'm concerned that there isn't enough clearance to handle that much extension into the combustion chamber. Out of curiosity, I went to the NGK site and, sure enough, they recommend the projected tip plug for my engine. I can't find anythng about this on the Tohatsu site, but the "sticker" inside the cover says "B7HS-10" so I've been running either B7s or BR7s. I know that technology changes and I don't know what NGK recommended back in 2001 when this engine was produced. I only know what they are saying now. If, however, a change would, as the rep says, give me cleaner, fuller burning (like after a period of low speed trolling) and smoother running, then I'm all for it. I could, I suppose, put some clay on a plug to mimic the projected tip size and pull the engine through a couple times then check to see if there was any contact, but ... I figure one of you guys should already know the answer. In short, guys .. if I switch, am I asking for trouble?