i was looking around and found these....i was wondering if anyone here tried them out yet. or any thoughts about it.

http://www.mazdaboys.com/HKS_M_Serie...0003-m45re.htm

 

All four Heat Range 9? I don' t see any description between leading an trailing.

 

I use them, the leading is 9 and trailing is 11. They work fine as long as the car is driven the way its suppose to be. I have no problems with start up with them.

 

here the link for the leading plugs
http://www.mazdaboys.com/HKS_M_Serie...003-m55rel.htm

i supposed the other link is for the trailing plugs also they sell multiple different versions of them just scroll down untill you get to the spark plugs

http://www.mazdaboys.com/Engine_Parts_s/246.htm

 

I should have known you would have HKS plugs

 

that's how i roll.

 

I had them wayyyy b4 u guys did :P

like Ngo said, its 9 and 11, so it's colder, much colder than stock.

so in the other words, it totally sucks for city driving, my plugs had carbon all over in just about 5K miles. so I dump them and re-use Stock NGK. but it did made a few extra pony, that's what my butt dyno told me

 

ah ok cause i was trying to hold off changing my coil packs...but the car started miss firing the sunday at the track......i got a flashing cel but it wen away after it stopped miss firing......