I agree.
Anytime I even tried "better" plugs in an engine it resulted in early failures.
The plug is part of the engineered design of the engine. Don't mess with it unless other things are modified and you're having issues.
By the way, so far here's what I've found with the Continental PureContact tires. I've driven 410 miles on them so far.
They ride noticeably harder than the OEM tires. So much in fact I assumed they had too much air in them the day they were installed so I checked them and found they actually needed more. The place put 35 PSI in them so I upped them to 38.
Even though they ride harder, they are quite a bit quieter as far as road noise.
Dry traction doesn't seem any different than OEM though it may be better? Definitely not worse.
Wet traction is A LOT better than OEM. This may be because the tires are new but I don't think the OEMs were ever even close to this good. We're talking taking off from a stop where the OEMs would've either spun continuously or triggered traction control if it was on, the Continentals felt like I was on dry ground. Simply put they amazed the hell out of me this morning multiple times while it was raining. I'm really impressed. This was all during my commute, a trip I've done hundreds of times now and I know how the car behaves in the rain at these areas. This is completely different. The last one was I took off at a light turning left where it's really bumpy \ patches \ manhole cover etc and still no slip and I was pushing it intentionally.
Yeah, I'm calling bull**** on the "700 rating means worse traction" These no doubt earn the surveys they get on tirerack. I guess the OEMs really are garbage.