19mm or 26mm plugs?
 

Does the 04 STI take 19mm or 26mm sparkplugs?

And modified engine, is that 7 or 6 plugs? (NGK Iridium ix?)

/Jesper

16mm

oh and i would go with the 7's

NGK states they are 19mm ? That was my concern. They said 19 or 26, that made me confused... :)

ANd is that a good plug or du I go with the platinum 7's ?

thought they were 14's,but could be wrong maybe there 16's

and i would go for 7's on a modified engine

people are using PFR7B - but why not Iridium plugs?

Well - bought som PFR7B's - hope they are the right ones