Fired the Z up about 3 weeks ago. Ran great. So now weather is breaking and I fired it up again and has a skip on #3. Bad injector, coil is open. Only like 300 miles on them. Bought them in 07 from Deatschwerks. My receipt says they are 555cc but now they only apparently sell 550cc? and in a set of 6. My engine is fully detailed (chrome, paint, etc) so I'm a little more than pissed. I'm waiting for a call back from them but I know I'm sol out of pocket here. Anyone have any feedback about these injectors or if I can just change one? They are supposably flow matched.