Decided to throw some new plugs in the 2008 Ducati Hypermotard 1100 and these were a direct swap in. 4 new plugs and she fired right up and seemed happy with the spark on my test ride! Can't go wrong with NGK's...Love the product and exactly what I wantedInstalled these on my 2007 BMW R1200R. A set of four obviously needed as there are four spark plugs on the bike. After install, initial start up, and a short ride the next day they seem to perform well. I might would even say it started easier than normal. Not sure about how much quieter as the motor already seemed to be quiet with 32k miles on it. I’d recommend them, and will purchase them again in 15-20k miles to replace these. Whether it calls for it or not.It says not for the 2009 R1200GSA but not so. I replaced the OEM plugs (NGK DCPR8EKC) with these iridium plugs and not only did the bike idle like a purring kitten but whoa! It takes off like a like a race horse! I did not gauge them but did test the gauge. I have not noticed a difference in gas mileage or engine temperature. For GSA use the 16mm - 5/8in thin wall socket, preferably magnetized or with a rubber grommet.One year in use (low mileage rider) and still clean.Muy buen inversionFit perfectly on my '82 Goldwing GL1100A. Bike fires right up every time with these plugs. Couldn't be happier.2019 Indian Chieftan Limited, 116 ci w/ LLoydz everything...runs very smooth!I stalled these on my HD VROD Night rod Special. The difference from HD OEM is very noticable. The Bike cruises amazing! You won't be disappointed!Fits 2012 BMW F800STEverything went well, the product corresponds to the descrption and I am still using them in my car.perfect.I bought these for my 2018 Can-Am Defender. It's been said that these were the "go to" plugs for this particular model of side by side. I was happy to see they had them on Amazon as they seem rather difficult to track down in my area. The price is a little higher than what other report they get them for, however, I bough the 4 pack so it made it a more reasonable cost.Once they arrived, I had a quick look and they are nothing really fancy over other plugs. Our SUV uses Iridium style plugs and they do last a very long time. Once I installed them, I fired up the rig. It started great and seemed to idle just as good. I've now been riding with them for 2 weeks and can say that although they are a great plug, there really is no difference between these and the ones that were in the rig to start with.Overall, I would still buy these for the simple fact that they are supposed to have a very long life. We'll see how that turns out.Pros:4 pack is reasonably pricedIridium is said to last longerCan take hotter sparkCons:a little on the pricey sideno noticeable difference over stock plugsHo riscontrato una erogazione più piena a tutti i regimi rispetto alla standard, certo non sono un miracolo ma siccome è un plus abbasta "economico" lo consiglio. Aiuta in fase di accensione sicuramente