NGK (9160) RC-ZE21 Spark Plug Wire Set

These replaced a set of wires that had been on the our 1997 Miata for almost 15 years. I also replaced the plugs. As you would expect, there was an immediate improvement in how the engine ran. I've read complaints about the quality of the connectors. Mine all clicked when they went on, and after a week of driving, the remain tightly on plugs and coil. Visually, they appear to be of very high quality. You can buy cheaper wires, but these appear to be heavy duty and I expect that they will be on the car for some time.

If you’ve been in the Miata world you know these are the only wires that last a decent amount of time. Buy once cry once.

Theses NGK wires fit my '96 Mazda Miata perfectly! As stated in another review they are numbered for each cylinder so they can be matched to the ignition coil numbers and basically made to the exact length needed to reach each cylinder so there isn't a bunch of loose plug wires along the top of the head. Coupled with a new AC/Delco ignition coil and NGK Iridium plugs my old girl runs great now plus the blue wire color adds an interesting, clean look to the engine compartment.

The NGK ZE21 Spark Plug Wire Set is a great product. Like all NGK products, it just fits right without having to modify it. The spark plug wire set is made for the 1990 - 1997 Miata and the length of the spark plugs wires is perfect. I like pre-made spark plug wire sets and not the universal type that require the end user to cut the spark plug wires (to size) and then to crimp on a terminal for each spark plug wire. When you purchase the NGK spark plug wires make sure you purchase the "blue" ones which are the premium set and not the standard "black" spark plug wires. The spark plug wires should be changed every 30,000 miles on a Miata to maintain performance. These spark plug wires are exactly what is needed for maximum performance, so don't bother purchasing the so-called "high performance" spark plug wires because you won't get a better spark plug wire for your money.

If you check the web you will see that the stock plug wires from Mazda for the Miata's do not last. These premium wires are absolutely worth it. My '99 Miata was stuttering when squeezing on the gas at low engine speed (say 35 mph in 5th -- top gear in my Miata). The comments on the web said that a common cause of the skipping at low RPM was the plug wires. I changed to these wires and the problem went away. I did not change anything else so it had to be the plug wires. I think one of the big reasons you need top quality wires is that the wires run right across the top of the engine block with very little distance to the metal. In between the heat and the proximity of an excellent ground it is easy to see why you need the best for plug wires.

Update: I got the second set and they fit just fine. Seems like the earlier set I got was a dud. Go figure. Previous Review Below: For my 99 Miata 1.8. Got a set that did not click onto the spark plug when seated in the engine. Clicked on just fine when outside the engine. Seems the wire was placed too far up the boot.... not great in terms of their quality control. Read a few things online about people having to modify them and scoot the wire down... junk to me if you have to modify it to fit. Returning for a replacement... let's hope this was just one set I got...

TL;DR Having misfires? Here's the fix (along with some new plugs). For about a month or two after I bought my 1994 Miata (1.8L), the engine had been "burping" and shaking every now and then at low RPM, making odd noises, vibration and not a whole lot of power below 2000RPM. Guy I bought it from said that the plug wires had recently been changed, and they looked in pretty darn good condition - so I tried setting timing and changing out the spark plugs for NGK ZFR5F-11 plugs, which helped a fair amount. However, it was still burping and heaping around in a way it shouldn't have. So as a last resort, I got around to buying these plug wires, because why not. They came in a dinky cardboard box and visually looked no different from the ones on my car, but they take 2 minutes to change so I installed them anyway. WOW, what a difference. Launches are smooth and the engine has a tremendous amount of low-end grunt, downshifts are buttery smooth, everything is so soft and smooth. Just buy them if you have any doubts, they're a maintenance item on miatas anyway and they're cheap.

Replaced my 2000 Miata Special Edition spark plug wires. Fit was perfect, car runs great. I'm very happy with this set of wires.

Nice wire set. Easy to install on my 2000 Miata SE and looks good too. Goes nicely with new NGK spark plugs.

Was advertised to fit a Mazda 626 2000 2.0lt, but several of the leads are to short, so the set is useless

The airbag light on a 1994 Mazda MX5 MK1 intermittently illuminated. Not ideal if you wish to sell the car, let alone get it through an MOT. I changed the spark plugs, replaced the air filter, and replaced the old(ish) ignition leads with these RC-ZE21's. Success! Turn ignition to on, airbag warning illuminates (as it should) and remains OFF. The vehicle starts faster, feels better & hopefully will sell!

Works like a charm, easy install. It's authentic NGK and so far works great on my NB miata. Will update if there's anything but I don't have any doubts of the product.

Très bon kit de remplacement !