leading and trailing spark plugs :?
 

i got 4 NGK Spark Plugs Part #5255 BUR9EQP plugs for my car. there all the trailing plugs. i was wondering if it still would work if i used them. because the only difference i see is the heat range for the trailing ones are higher then the leading. correct me if im wrong but wouldnt it be better if all 4 were a high heat range?

well, i mean, if you wanna do that go for it. but there is a reason why you wanna run 7's and 9's. how bout you go back to the store and swap them out.

You might get some money back too! I think Ts sell for more than Ls these days.

^ Or vice versa... I cannot remember. The last time I bought NGK leading and trailing plugs, one set was four dollars more than the other two.

i bought them online and i would have to pay for shipping if i wanted to return them... i searched up on racing beats website and it says the heat range is just the ability to remove heat from the combustion camber. ima try them out, see what happens.