NGK (8660) RC-XX89 Spark Plug Wire Set

I gave this 5 stars because the wire set themselves are great. I do have two 'dings' though which are NOT related to function or fit. 1.) the wires are double labeled - and NEITHER are right. One is tape with a number, and the other is directly labeled to the wires. I changed out one by one and ALL the lengths are 100% right, but if you went by labels? Not good. 2.) The delivery. Originally it said delivery on 4/19 and then on 4/19 it said 'oops - they'll arrive 4/25. That ticked me off but again - the wire set themselves are great. Fit perfectly in routing, and also under the little silver plastic cover that screws onto the valve cover. I recommend this product! Don't trust the numbering. LOL

Installed easily on a 2005 hyundai accent. Wanted to spruce it up since the warranty just expired, got these along with ngk iridium spark plugs, and they work flawlessly together.I somehow installed one of them incorrectly and had a misfire error code for a second, but just turned it off, re inserted all the plugs and it worked just fine, just gotta make sure they are pushed all the way down.I noticed that whoever changed my spark plugs prior (some shop) they inserted the OEM wire set with too much force and warped 2 of the seals, nothing seemed damaged, but there is some noticeable coloration to rim of the plug hole, not concerned though. The rim of these seems to create a great seal, and they give a confident snap into place.All in all installed these, new spark plugs, a K&N short ram intake, and a simple magnaflow universal exhaust, car is not fast, but much quicker, and throttle response is almost sporty, and all for under 500 total. I'm no racer, but I appreciate the new ability to pass cars quickly on the freeway, going from 70-80mph is much faster now, and overall acceleration has improved drastically.

I installed this set in my Hyundai Coupe 2005 1.6 CC after 156,000 KM with the stock setInstallation with NGK Iridium IX set, amazing fit just like the OEM, and they even looks much better!Vibrations are over, engine sounds like a sleeping cat, very very very smooth acceleration and noticeable improvement in fuel consumption, amazing stable acceleration on high speeds ... improvements are really noticableDefinitely such a great upgrade and investment especially on the long run

Three of them were flush to the valve cover but only one of them stuck up just a little from the others but they work great and easy install, join the fb group Hyundai accent gt 2nd gen , with the rally car as the cover, I'd like to help you out with any repairs you are doing if you've got questions and I've gone the work, I've got answers

My OEM spark plug wires were wearing out, and appeared to have arching issues. NGK set solved those issues. I had it for a while now and the wires look great. Great quality, well worth the extra $.

I use these in a tropical location subject to high heat and humidity, and they perform flawlessly.I recommend them as they are well tailored and fit exactly.

Packaging was all beat up and the product looked dusty, however it works fine.

I liked the wires for cylinders 2-4. Cylinder #1 wire was 5 inches too short. VERY disappointed as I wanted to tune up the whole car. The plus is the portion that connects to the spark plug sticks up a bit and is rigid helping to keep the wires away from heat shields, etc. If only the one wire were long enough. I installed on 1998 Hyundai Accent hatchback with 1.5L.