a friend of mine installed some NGK 6510's in his car after speaking with his tuner. after second guessing him and asking way too many other people, he is nervous that they are the wrong plugs. does anyone here know if they are correct?
They are a slightly shorter reach with a little bit bigger gap. I'm sure it will run ok, but I'd switch to the 2309 or another applicable plug that's the correct specs. I feel for him though. Plugs are no fun to change, I've done them.