Choosing the correct spark plugs after going single?
 

I was wondering how to choose the correct spark plugs after my single setup is complete?
I have read so many differnt opinions on the board that im kinda lost. According to rx7.com using #9 plugs in all four location is best for anything much over stock.
thanks in advance
--Arron

We only sell NGK #9's for leading and trailing. Thats what we run and put in customers cars when doing single installs.

Jason

Yeah, I've ran 9s on my car even when I had bolt ons. Some people run colder plugs, but unless you're really pushing a lot of power there's really no need.

9's should be fine unless you plan to run it real hard for length of time or plan to go up a lot in boost

I’m running 11’s all the way around, but my car sees 22psi regularly, and goes to the track every chance I get.

thanks. i guesse i need to order some #9 plugs here in the near future.

i run iridiums
ive ran 9's 10's and 10.5's and 11's on the street just gotta get em warmed up..
but right now im running standard 9's and 10.5 iridiums..
warm them up in the morning for a few min and your good to go

NGK BUR9EQ you're good to go.