09 Civic Si -- What mods increase gas mileage and performance?

[emerican]

No i banned them and deleted all their posts.
Its a constant battle between the mods and them we do our best to compltly keep them out of threads or them not be here for very long.

 

[Shanesaw]

i usually use NGK but i figured i would give the E3s a shot since theyre sopost to be good and theyre cheap instead of $20 a plug for the top NGKs

 

[Slow y Low]

Good stuff emerican. Keep up the good work Mr.Moderator. And yeah, $20 sure is a lot, i can see why you would want to switch. I get the iridium NGK's from autozone for like just under $8 bucks. I love em. Let us know how the E3's work out for you.