Autolite Iridium XP Automotive Replacement Spark Plugs, XP5703 (4 Pack)

These work amazingly well and were cheaper to get from Amazon than local auto stores. No issues installing or use so far would buy again.

The best plugs so far. I put them in my kia optima and they got my car running better then ever.

Worked absolutely great. Went in and changed all four spark plugs. Found out in the end it was the ignition coil on cylinder two. But the plugs needed changing. I was at around 93,000 miles so it needed it. Also changed that ignition coil, then the pcv valve, and both engine and cabin air filters. Definitely recommend hasn’t done me wrong yet.

Great product have used them before, after job complete vehicle had misfire cyl #1. Bad plug had to see local vender to complete tune up, brand new spark plug. Otherwise great product

Put in my 2015 Sonata 2.0turbo without any fitment or operation issues. Replace for the recommended 45k service, no issues so far.

I changed my plugs out last week and went on a road trip this weekend. I cannot believe how much quieter and smother the engine runs. Passing power was fantastic.

Buen producto

was wrong size dor my car

No le puse 5 estrellas porque al ser de iridio pensaría que vienen calibradas, pero se tienen que calibrar

These are a perfect fit for my 2013 Veloster. The car feels like new after installing them. It accelerates much better and feels like the power has also been restored. And the price that cannot be beaten! Very happy!

I've been looking FOREVER for a set of four 3479's that didnt' cost almost $100CDN+. You just can NOT get them. I just happened to find these, price was perfect, arrived in days. no more power loss @4000rpm, cyl2 plug was finished **Fits KIA/Hyundai Theta 2 (Turbo GDI) for Denso 3479 replacements exactly!**

Merci 100% satisfait.

I didn’t know how to rate these. For me they are 1-star because they didn’t work, but that doesn’t mean they couldn’t work very well on another vehicle and be a 5-star solution there. However, I can say from experience now, if you own a 2013 Hyundai Veloster Turbo, do not buy these. I bought them because I had seen them recommended online as a good option for Velosters. I had a misfire problem on one I had just purchased with 188K km on. If you have a similar vintage Veloster with a misfire problem and done any research, you know this is a widespread problem and many people have spent a lot of time and money trying without success to get to the bottom of it. It was fine idling and under light load, but under hard acceleration, it would begin to misfire. On various cylinders. I had a simple Ancel 310 OBD reader to help see what was happening. Obviously, plugs and ignition coils are the most obvious place to start. I had seen these Autolite plugs recommended and the price was reasonable, so I ordered them. I also ordered a set of ignition coils from Amazon as well. If you have been researching this issue, you have likely seen many posts warning against this and saying to only go with OEM coils. More on that shortly. The plugs that were in it were clearly a long way from new, though I had no idea how many km were on them. I was hopeful that changing plugs alone would solve my problem, but I want the coils there just in case they didn’t. I was shocked, however, by the results. I had checked the gaps on all and they matched my old ones at 0.030”, which is OEM spec. When I started the engine after installation, I could tell immediately there was a problem. It seemed to be missing a bit even at idle. When I took it out and applied only moderate throttle it started missing badly. Unlike with the old plugs, no my check engine light came on and actually started flashing. I couldn’t even get close to the power I had with the old plugs before they started missing. Fortunately, the engine light would stop flashing and actually go out if I just idling it along. But if I stepped on the throttle, the same problem reoccurred. The misfires were on all four cylinders. Back to the house and time to try the new coils. This didn’t solve anything. The behaviour was unchanged. At this point, I wasn’t sure if the problem really was the plugs though, because of the many posts I had come across on forums warning against using aftermarket coils. I thought the next thing I should try though would be the OEM recommended plugs, NGK 91568 Laser Iridiums. My local Auto Value had them in stock $5 cheaper than Amazon, though they were still nearly $20/plug. I can’t endorse or dispute what the parts reps there told me, but I feel I should pass it on. They said that Autolites are good primarily on Fords. They should never be used on Asian or European imports. I questioned why and all they could say is that there are many problems with them on imports, which should have only NGK or Bosch plugs. I can say that at least for my Veloster, this certainly seems to be true. The rest of the story for any of you with Veloster Turbo misfire problems is as follows. I replaced the Autolites with the NGK’s and also went back to the original ignition coils. Upon starting it up, everything seemed good again. It ran smooth and revved up nice and smooth. However, when I drove it and accelerated hard, the misfires started worse than ever, though oddly, the check engine light never came on. The stored and pending codes were there and visible with the reader, but no MIL (Malfunction Indicator Light). Fortunately, I had the OBD reader, because I could see that all the misses (and they were in the thousands) were on only two cylinders. The other two had none. But it was running so rough, I was limping home. Even at idle, it would barely stay running. Since the misfires were gone completely on cylinders 3 and 4, the obvious thing to do was try the new coils on 1 and 2. And, believe it or not, the misfires were gone. It now pulls hard all the way up with no misfires or codes. I really had two problems, both plugs and coils. For those of you wondering, the coils I got here on Amazon were “MACAX Set of 4 Ignition Coils Turbocharged UF707 27301-2B110”. I now have two spares because I only needed to replace two coils. I’m not replacing all four simply because I have in mind the warnings about cheaper coils. Will they fail quicker than the other old two I have in there still? Don’t know, but I will replace whichever ones fail next. For now, I can say these MACAX ones worked great for me so far, and cost me over 80% less than the Delphi ones at Auto Value (the most affordable place for auto parts locally). That was a very long review (I left a similar one for the coils), but I hope someone battling this Veloster misfire problem will stumble across this and perhaps will be helped. What is not helpful is Amazon saying that these Autolite plugs are compatible with my 2013 Veloster Turbo. They are not.