On my old Jeep Wrangler, the only plugs that it ran well on were NGKs.
Engine starts better and in some cases the engine runs smoother. The big issue now a days is getting a legit NGK instead of a Chinese knockoff.
NGK BP7ES replaced the torch that took 3 to 6 attempts to start on LP from large tank every time. Now starts on 1 try every time w the NGK.
I been using ngk BR6HS plugs for years.
That said, make sure they use quality parts. BMW/Bosch spark plugs and OEM pulleys (and belt) are a must. NGK plugs are cheaper and don\u2019t last as long. Same goes for off-brand belts and pulleys.
I just swapped out an original set from 2006 that had exactly 165,050 on them. Car still ran great before the swap.
Went with Bosh double platinum plugs at 60,000km when I notice a stumble at idle and that's the interval for change. I instantly went from best of 9.6L/100km to 7.8L/100km big difference in performance and smoothness and i prefer a German plug in a German car with Bosch electronics.
For the intake i would recommend k&n filters systems, racing plugs are not even worth it, better look it up some NGK iridium
2018 Kia Soul Base, 57k miles, on the third set of plugs and they are misfiring already. Factory plugs lasted 30k miles, followed up with Autolite plugs lasting 10k (which I chalked up to being cheap/low-quality plugs), but now these NGK iridiums are giving out with 17k miles on them.
Just another rare earth metal to charge the user more for. Factory specs call for NGK Iridiums. I can't see a reason to deviate.
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