Quote: Originally Posted by
bigdave619 
i have the iridiums but they are the same heat rage as the stockers. or so im told
you need to get the ones with the "7" in their

????they are 2 steps colder and the iridium fine wire has never been an issue with any srt-4 (even DCR) the platinum are definite NO NO
BUT
with 2 step colder plugs they will not get hot enough to burn off all the crap and will foul, so i would get a set 1 step for street and a set of 2 step for the track. that will keep you fireing at 100% 24/7 (or just gap em to death like everyone else

)
LZTR5AIX-13 STOCK
LZTR6AIX-13 1 STEP COLDER
LZTR7AIX-13 2 STEP COLDER