I have a 2006 4x4 3.7 v6 and was wondering which spark plugs specifcally would boost mpg and/or horsepower. I've read a lot on the autolites and ngk's but there was no real mention of a performance boost. Any help is appreciated!

 

The E3 spark plugs helped in the horsepower a bit I think, but I was burning way more fuel and my coils kept failing. Stick with stock ish plugs. I'm running bosh platinum plugs with no issues. Stay away from double platinum plugs. Copper might still be best for the 3.7.

 

These trucks do not like fancy plugs. Stick with copper core.

 

I heard the E3's really aren't that great but I'm not sure how true that is.

 

If a spark plug could boost your MPGs or horsepower, that spark plug would be in EVERY production car from the factory right now.


They would all also have cold air intake kits installed on the assembly line.

 

Get copper. 9/10 recommenced not getting platinum.

 

I run the autolite 3922 plug, 2 steps cooler then stock, but the 3923 would be a great plug for you, one step cooler then stock.