Which are the spark plug do you think is the best for the car???
There isnt any reason to go with colder plugs..Just stick with the stock heat rated NGKs.
Why not? is it going to hurt anything?
Its not going to hurt anything but they are not going to help anything either.They may foul out easier then stock.Even the people at cobb say that there is no reason for them.
Have you heard anything about regapping (closer) for using more boost. I think some call it spark blowout?