Senior Contributing Member
Car: 2007 Chrysler 300C SRT Design
Join Date: Apr 2008
Location: Dallas, TX
Thanked 25 Times in 20 Posts
I went with Autolite Platinum AP5263
I got mine at rockauto.com. List price is $2.51 each, less a rebate of $1.25 each that Autolite is running until next month (you can get the rebate form on their website), bringing the net cost down to only $1.26 each....cheaper AND better than the lowly OEM Champion copper plugs.
I also applied a discount coupon code to shave a couple bucks off shipping, which was ultimately cheaper than buying at the local parts store and paying tax.
Some guys spew nonsense about hemi's not running well on platinum, iridium, etc. I can tell you from my experience (5.7L hemi) that there is absolutely no discernable difference in idle quality, performance, fuel consumption, etc. between the Autolite Platinum plugs and the Champion copper plugs. I chose these because they are higher quality and with the rebate, they cost less than the copper Champions.
The platinum plugs should last far beyond the 30K mile specified change interval, but I plan to change them every 30K miles anyway, just to satisfy the requiremenets of the lifetime powertrain warranty.