I recently bought a 2004 Acura 3.5RL with very little history on the car. Not knowing when the spark plugs were last changed, I figured these NGKs would be a worthwhile investment. As far as I can tell the 6 Denso spark plugs that I removed from the car were original spark plugs. The car has 198,000 miles on the odometer and those Denso's were broken! The new NGKs have definitely given the car more power. It feels lighter under acceleration and maybe even a little quieter. I expect fuel economy to improve now that I have more spark. I have applied NGK to all my Hondas and they have never let me down.
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