The stock plugs on the 2015 DL650A are NGK CR8EIA-9. Locally, the only ones I can find are NGK CR8EIA-10. According to NGK the only different is the gap. Stock plugs are 0.9mm whereas the CR8EIA-10 are 1.0mm. That's only a 1/10mm difference in gap, slightly more than a human hair. Would that make a noticeable difference?