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Which copper plugs on stock L32, 606 or 605?





I got a cone on there. Exhaust is stock, no u-bend.

The 104's worked alright. Kinda didn't realize we drove it over 20k already. Gonna give a range higher a try.
 
I ran AL103R's over 20k. They were a nice golden brown. Big misconception in this community is that colder plugs don't last a long time. While they are recommended to be changed every 20-30k, there isn't much of an issue with running them longer.
 


If you notice gas mileage difference by putting colder plugs in, then I don't know what to tell you. I never noticed a damn difference. And if you're talking 1-2 MPG; you can make that up by driving style; easily.
 
Or just not put the wrong plugs in in the first place and not have to make up for anything with driving style?
 
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