I put autolite 104's in my GTP today along with new wires. wow i mean WOW i felt like kickin whoever owned my car last in the nuts! I noticed my plugs in the front of the engine "odds" were in bad shape with no matereial left on the plug. then i noticed WOW there is NOTHING left of the rear plugs "evens" the old owner must have gotten pissed off and said i cant change the rear plugs.... haha i got em done tonight wow it was a pain in the arse BIG TIME! but well worth it.. starts on a dime and i feel more power? NICE =] o yeah and i got like 10 slices on my hands due to heat sheilds and such =[