i was changing my spark plugs to the NGK part # LFR6A-11 one step colder and they did not fit, the ngk plugs are the same lenght as stock but they are alot fater. so since there is not a colder plug out for the 07 is it still safe to run my 75 shot

 

Don't run nitrous without a colder spark plug. Wait until you can get a hold of colder spark plugs for your car.

Also, the stock part number for NGK spark plugs on 03-06s are NGK PLFR5A-11. The hot type being PLFR4A-11 and the cold type being the PLFR6A-11. With that said, I would assume whatever the spark plug part number is for the stock 07 350Zs from NGK, you just need to add 1 to the single digit number for the cold type(-11 means it's gapped -11 from whatever the original gap is, iirc).

 

no one makes a colder spark plug for the 07 yet i have searched. ngk doesnt even have a spark plug out for the 07

 

bosch and autolight makes platinum plugs for the 07 but they said it fits 03-07 but there is no way it can because of the size dif.

 

so anyone know if any one is making a one step colder plug for the 07+ anytime soon

 

i need some if someone is but i am spraying a 70 shot on mine and have no problems so far