I brought my RX8 into my local garage for a tune-up and I think they put in 4 of the same plugs, all of the trailing plugs. How bad is this and what problems might arise? At the moment my car seems to be running better than before the tune-up.

 

What makes you think they are the same plugs?
You can remove the wire boot from the plug and see the identifier.
That way you'll know for sure if they are correct.

 

oh man..thats what DIYs are for the plugs are an easy job on this car.



Ive heard two things on this....
do not run trailing plugs in your leading position. They are too short and the electrode design will induce shrapnel
And
Gaps- Maximum: Leading 1.5mm (0.059in) Trailing 1.4mm (0.055in) [/B][/I]

Hope that helps, i dont know if the length issue is true, but thats definitely the gap info, I would make sure as soon as you can