they look like the race plugs, not the stock fc/fd plugs

 

edit: NGK's web site shows 7's for L & T but Racing Beat show 7's & 9's and list them for $38. I emailed sparkplug.com for a price quote.

 

i'll have to look but mazda is 6 and something else

 

There should be 2 sets of heat ranges, There was a tsb about fouling plugs and flooding, mazda switched the cars that had these problems over to hotter plugs, and i think all the cars comming in now have the hot plugs from the factory.

 

they are expensive

 

have these rx8 plugs been tested in the older 13bt's yet.. ?

 

Just to clarify, the lower the number the hotter the plug. I mighta just read some of the posts wrong or somethin

 

I ran the br8iex iridium plug that RB recomends for race apps and it stubled everywhere as oposed to the stock 2g in the leading and stock 12a plugs in the trailing. Mind you I run a s-3 13b with a MSD_DIS igntion... For yous who don't know I run the typical MSD directfire, but instead of using two coils in a series or parallel I use a MSD DIS coil. It made such an improvement on start up and gas mileage it's sickning!

 

[quote name='full-cruise' date='Sep 15 2005, 05:09 PM']have these rx8 plugs been tested in the older 13bt's yet.. ?


[/quote]



i ended up running a set in my gsl-se for a while, seems like it ran smoother?