Ive got a built GSR and I have a tune appointment coming up. I'm currently using the stock "heat range" plugs and it doesnt look like my colder NGK's will come in on time for my dyno day. What do you guys suggest I gap the stock plugs to for 12-15 psi?

 

.028-.030 is what is reccommended for boosted cars.

 

oh ok, yeah i knew that was the gap for the colder plugs, just didnt know if that was ok with the hotter plug. Thanks.

 

<FONT COLOR="red">dont use the stock plugs at all for 12-15psi!!!</FONT>