Automotive
ACDelco Professional 41-109 (12622561) Iridium Spark Plug (Pack of 1)
Bias-adjusted across 525 Amazon ratings, Bayesian-shrunk to the category prior so the headline score reflects relative quality — not a raw star average. Cohort: Automotive.
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How the score was built
- Amazon ratings
- 525
- Raw star average
- 4.7 / 5
- Bayesian avg
- 4.63
used for the Bayesian percentile
unadjusted Amazon mean
raw rating shrunk to the category prior
Buy it: View on Amazon →
Same category · Automotive
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