i just bought my rx8 2004, it just has upgraded intake and a header.

i want to know which spark plug will be better:

denso iridium racing
denso iridium power
or mazda nkg OEM

i want to know if the racing gives me a little more perfomance, or its like my friends tells me, racing is for cars that needs it, that has perfomance upgrade.

HEEEEELP

 

Racing plug runs colder, not good for a daily drive. There is no performance difference. Dif is that racing plug may minimize detonation under racing conditions because it's colder and it will most likely foul if used for regular dd.

 

so, whats your recomendation... NGK MAzda OEM? im not a racer :P (Sorry about my english)

 

I guess I'd go with the NGK bcause of price.

 

thanks :D

 

You will get couple more hp for running colder plugs, and better for FI applications --- but yep your plugs will foul a lot faster under "streets" condition at stock N/A.

 

The Mazda NGK are Iridium. The ones I put in on Saturday had the IR on them.

 

Yes the OEM-NGK are your best bet. Have the coils and wires been replaced yet? Let us see the plugs when you get them out.

 

nop, the coils and wire are OEM

 

ngk oem

 

I have never seen anyone NOT recommend the NGK OEM plugs for a rotary engine.

Stay with the NGK OEM's.