Whats up all,

I drive a pretty much stock 99' Civic Si, and am looking to do a nice little tune up. I've heard some good things in the past about Denso and NGK, but Im thinking that performance plugs arent the best choice for a NA stock engine.

What would you all recommend a good spark plug for now, being a stock daily driver?


(NOTE) Eventually Im going to be rebuilding the internals and running big boost, when that happens would a more performance plug like a 1 or 2 step colder be a good option? (Ive heard that Iridiums rob horsepower unless your running high boost i.e. 25psi+ is this true?)

This is my first vehicle in which I actually care about how long it lasts, so I just want to make the right decisions on everything I upgrade even if I sound semi-n00bish doing it.

Thanks in advance.