Everything arrived quickly and the install was a lot easier than I expected. These plugs really brought life to my '14 550i!

The NGK sparkolaters work just fine and found the car ran a bit smoother after installation at ~55,xxx miles. I also checked the gap and they were all gapped appropriately upon receipt. The only issue I ran into is that I cracked the very top of one of the ignition coils when I was removing it. The crack is located in the lever mechanism that folds down, clicks, and secures the plug/harness onto the top of the coil itself; the crack is NOT located in the body of the coil. I didn't order ignition coils and am kicking myself for not doing so. As a result, I ended up reusing all four of them and did what any self-respecting DIY'er did; I secured the cracked coil and the plug/harness together with a zip tie :) and haven't had any issues.

Great price & shipping time !

Worked great, OE plug at a lower price. Fit perfectly in my F30 N20

Just installed yesterday. Gapped to 0.026 in preparation for Bootmod3 Stage II tune with catless downpipe. These work flawless at this gap for the Stage I tune. The real deal. Not like the fake ones people are getting on the jungle website. Buyer beware of the jungle website knock offs. Cheap usually means just that, cheap. Just get them here. You get a lifetime warranty as well. You'd have to be stupid to risk getting fake ones.

Noticable difference in cars start up, acceleration and idling. Quality spark plugs for a fair price.

I had N55 stock Bosch plugs before I purchased those and I wasn't happy with them. I have stage 1 MHD installed, but even with the stock map the engine had a slight hesitation at idle, every 45-60 seconds. The Bosch plugs were replaced not even 7K miles ago. I then researched a little bit and found a lot of people recommending these, as 1-step colder for tuned N55. I must admit I was a little reluctant because the price of each is double, but it paid off. No more hesitations and the engine runs very smooth now at idle. And it also seems that they cured the every now and then idle fluctuations. Very happy I took this step. Now, I don't know if FCP would consider this a Lifetime warranty replacement, as those are something else.

Perfect for tuned cars. Worked flawlessly.

This is the best spark plug for your tuned N63, getting ready to place another order for spares!

A real good upgrade over the oem for my e30