NGKSpark Plug SILZKBR8D8S 97506 Pack of 6

Replaced the plugs in my 2011 BMW 335Xi. The performance and gas mileage has improve. Still satisfied after 3 months of driving and 10,000 miles. I commute on long drives daily and love the response from the new plugs and coils.

Received legitimate spark plugs and they seem to work well. 2011 BMW X5 35i

The media could not be loaded. Overall inspection of spark plugs looks excellent. I don't have a way of verifying if these are legit or not. Packaging material looks authentic also ceramics, threads, contacts, washers and iridium tips looks solid. Please note they are magnified. There is a laser engraved M25S on the ceramic also. With my thorough inspection, I believe these are legit.I cannot rely on tube videos since those 6 point type NGKs.I'm giving it a 4 stars for now to be fair and I will update it after I installed and verify performance and if the misfire on no.4 cylinder goes away. I switched coils 4 and 5 see if the misfire follows on 5 then it's the coil. I have MHD stage 1 plus on my 2016 Z4 3.5is, and the misfire just happened recently. The CEL reset itself after restart. The Bosch plug looks OK. The thread is coated with Anti Sieze compound. I will post an update review soon. Just waiting for the gapping tool. Some recommend 0.22 and others 0.18 for 2 step colder plug. I will gap it at 0.20 to be on the safe side for now.Update:I duplicated the acceleration that caused the misfire on cylinder 4 and no misfire on 4 or 5 cylinder. I decided to gap it at .022 since .020 is too narrow for a colder plug.I could feel the difference in smoothness running at idle.It seems like my power decreases a little bit but it just actually runs much smoother in all RPM ( no redline )than before. I really think that these plugs are genuine and if you added more HP on your N54 engine, switch to these plugs.

Now I read quite a few of the lower reviews for this 6 pack of plugs and was worried a small bit.***Please do note** that this part does fit bmw's with an n54 or n52 at the very least. I have used these plugs in the past and was even using them at the time of ordering from amazon. DO NOT use for better mpg or spark unless its needed, these run 2 steps colder and unless your running for performance than itd be best to use the 1 step colder NGK or regular bosch plugs.The worries I did have however came from the pricing. Not from being high, but from being low. Finding these plugs on other sites came to a low-high of around 82-90USD rather than the 77.43 found here. Adding to the fact with amazon shipping I can get it next day or rather within the week for free rather than the other sites taking 2 weeks or more without added shipping.My concerns started with these prices when I had read reviews where the plugs were badly damaged and cracked. However, I was happy to see that all 6 plugs have arrived safely to my house with no issues. Though replacing these had nothing to do with my actual issue the originals of these plugs that I had replaced had outlived even my ignition coils. After having replaced the true cause of my issue (the ignition coils) these plugs have run just as well as the last set I got from another site.Will come back and save this for future services.

Excellent Product.

Bought these for my n54 stage 2+ and gapped them to 0.20 engine is much smoother idle, acceleration, better fuel economy and most importantly more power. I Was worried they would be damaged because of how much it was moving around in the package box but they did a great job providing this cardboard protection piece highly recommend

Once you check the specifications on what to gap them at then you’re golden, solid product

Installed these and been using them for about 4 months in my 2007 BMW 335i, works great and item just as described. No issues yet