Hi folks, sorry for asking this Q, Im sure its been asked loads of times before...I've tried using the search but tis not helping me much

Anyways, I was wondering if anyoneknew what the best plugs were to use in my 97 Sti classic the only mod/s is a down pipe (de-cat) and full exhaust system.

I've seen loads of people write NGK's are the best but there's so many different codes for the Impreza

 

NGK PFR6B's should be fine, at that level of tune. That is the standard plug for that car.

 

Ok thanks, where is the best place to get them from?

I've seen NGK's in Halfords but I dont think they were that code.

 

i would a personally do use ngk pfr7's

 

We sell both plugs being discussed here.
Chris, would you like to let us in on why you would use 7's instead of the 6's recommended by us?


Mike.

 

Its just what i have been reccomended for my car. 97 type r with modest mods.

 

i have been running the same setup with a FMI/downpipe/catback exhaust n standard boost with a PFC and it runs fines no detonation at all. Detonation reading in the PFC is only max 15