I changed out the plugs in my Prelude (JDM H22a) with the Spitfire plugs for an H22a. I think the guy said they have a gap of 44. Any how as soon as I changed them my idle (after driving 1 hour) started jumping back and forth from 200 rpms to about 1200 rpms. Another problem was a real loss of power. It almost feels like a slipping clutch. I would give it gas and it just didnt pull like before. The last problem that I experienced was a real loss in fuel economy. So if you are thinking of going Spitfir plugs you might want to reconsider and if you do use them anyway then look for these problems in our car. If there is a problem Honda sells the EKG plugs (I think thats the name) for a grand total of 15 dollars for all 4 plugs. My car is back on track now running good with the Honda plugs. So for our H22a applications I would rate Spitfire plugs really low and not recomend them for other preludes.

 

NGK V-Powers

 

Thanks. NGK. The things work awsome.

 

splitfire plugs are pointless to have on any engine.