you can take this information for what you will, and it's more of a warning to not run them longer than the suggested internal more than it is a don't run them
i don't know how well you can see this picture, the plug on the left is a bosch and when I pulled the plug I thought that it had pre-ignited
it had roughly 45k on it, the ngk's next to it had about 120k'ish
you've also got a different bosch plug than this was too so hopefully it won't be as susceptible to drastic wear
but you should be just fine with those plugs for the suggested interval
have you noticed if you've got a slight stutter just over 4000 rpm and 4400 rpm with them?
