05-E55

I'd like to know what plugs I should get for a car with tune/pulley and headers? Would appreciate any help.

actech

I just did my plugs last weekend and I went one step colder and OMG what a difference. I have 06 55 with 80k on it. mods are mbh headers, primary cat and res delete with x pipe, 010 pump, smaller pulley, bwk, EC tune. car felt good after all that but slightly rough idle and just didn't feel mean enough for what I had. did colder plugs and bam! NGK IRIDIUM IX LFR7AIX2309. they sell them at most auto parts stores but I go mine from large online retailer for cheap.

05-E55

Thank you. Did you do it yourself? If so, how long did it take you? I did it on my S500 and it was no fun trying to get to some of them.

XSTAR

'04 with 53k miles & mods listed below. I just purchased the 1 step colder NGK Iridium IX Spark Plugs LFR7AIX plugs.

05-E55

Please let me know what you think after install.

XSTAR

It may a bit before I get around to the install and honestly I'm not really expecting to "feel" a difference given my car has relatively low miles. Really doing it can't hurt doing for ~$110 and will help with detonation.

actech

it took me about 2.5 hours from the time I popped my hood to the time I closed it. I pulled air filters and y pipe plus wires and coil packs. as long as you have correct tools its a breeze. for me personally it was a night and day difference. also I have only sec cats and my O2 sensors were throwing codes even with bung extenders on the O2 sensors and since plug change NO CODES!!!!

actech

it took me 2.5 hours and what a night and day difference. also I have my primary cats deleted and even with O2 bung extenders I would throw the cat fault code but since plug change NO FAULT CODES and its been two weeks. car drives better and feels meaner.

05-E55

Great, thanks. Any special tools? I have the plug wire tool from doing the other car. I've seen a swivel socket extension advertised, is it necessary?

sexyxe

Get some anti seize to put on the new plugs too. Swivel isn't needed. I have a short and long socket extension and between the two didn't have any issues,

05-E55

I read somewhere not to use that as there is a coating of some sort on the plugs already! I don't know if that's accurate or not.