Wow, 55K on an '04? I just changed my '04's with 128K. It had Denso's and I replaced with NGK. Really can't tell a difference. I had no trouble getting the old ones out just had to loosen wire harness. Put antisieze on the new ones but at this rate I probably won't have to change them again.

I had 128K on my plugs, changed them just because I thought they probably needed changed with that many miles. Old ones didn't look that bad, weren't missing and getting good gas mileage (28-31 hwy). I wouldn't change them if I were you unless you're having problems. BTW - NGK

'04 Neptune Base"Moon & Tunes"Tinted windows The "Love Bugs" have taken their toll on the nose of my car, lots of pits in the paint. Just did a "restore" on the headlights that were fading from the Florida sun.