NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCS vs NGK 5464 BKR5EIX-11 Iridium IX Spark Plug

Both options make for good, if unremarkable, Spark Plugs at the $35 budget range. While they should serve reasonably well, you might want to look into some other options at that price point.

If you're still interested in learning more about the NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCS and NGK 5464 BKR5EIX-11 Iridium IX Spark Plug, however, we wrote-up what we know about them:

No sources that do their own in-depth testing have considered the NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCS to be a good enough purchase for it to earn a spot in their Spark Plug roundups, which is typically a bad sign.

Taking a look at the NGK 5464 BKR5EIX-11 Iridium IX Spark Plug, we found that it hasn't managed to perform well enough to earn a spot in any Spark Plug roundups done by sources that conduct their own, high-quality, hands-on testing. That alone makes it difficult to recommend.

As a last step, we wanted to do a head-to-head NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCS vs. NGK 5464 BKR5EIX-11 Iridium IX Spark Plug comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.