Spark plug NGK or OEM Mazda

Plus they are nice BKR7EIX's (NGK Iridium 1-Step Colder than OEM) and barely have 5000-6000 miles on them, and are gapped to the recommended 0.28 of the APR tune, so there shouldnt be issues, right? As it turns out, my engine cares, A LOT.

Ours has been pretty reliable, had some issues with odd stalling once which was cured with new plugs/wires/carbon cleaning, rear shocks just went recently.

After I was done installing the new plugs and coils, I started the car and immediately noticed how much smoother the idle was. I then went for a drive and was really impressed by how much smoother and consistent the power delivery was overall, not to mention the graciously absent misfire under load.

Did this last night without any issues. The coils were in there tight but a warm engine and some tough talking got them out. I went with NGK Iridiums and the car seems to drive smoother - other than that, all is good at 60K.

Ngk Platinum all day

same everything but using a C2 Motorsport Stage 1+ tune. rippin!!

I run a cooler NGK plug in my boost increased and tuned ZR1 making 730 horsepower. They have been flawless and lead the market in the LS world also.

Today I ordered from VW TPS : - Quantum 5w 40 FS Oil & Filter - Oil Dipstick Tube - Fuel Filter - Pollen Filter - Brake Booster Pipe (Vacuum) (Pictured Below) - Interior Alarm Sensor Switch Have also ordered NGK Iridium plugs from Awesome GTI

Not sure what exactly your setup is/how well you have tuned for it, but on BKR7EIX plugs @ .028 and 25psi, I was encountering some spark blowout. Basically felt like the car dropped 2 cylinders, and my exhaust had muffled misfire sounds that basically sounded like a very fast skipping CD of fart noises lol.

Just reporting in after some usage... the NGK 4644 aka BKR7E seems to foul easier than the Autolite plugs I ran previously.