NGK 3951 Spark Plugs TR55 (8 Pack) | Replaces SP400 SP446 41-600 41-601 41-606 SP-413 241-606 5613869 5614283 5614284 AGSF22N AGSF23C AGSF32N R42LTS6 R43LTS6.

I am thoroughly impressed with the NGK 3951 Pack of 8 Motorcycle Copper Spark Plugs (TR55) for several compelling reasons.Firstly, NGK's reputation for quality precedes them, and these spark plugs live up to the brand's renowned standards. The copper core design ensures excellent conductivity and heat dissipation, which is crucial for maintaining optimal engine performance and longevity.Secondly, installation was a breeze. The plugs fit perfectly into my motorcycle's engine without any issues, thanks to NGK's precise manufacturing and adherence to OE specifications. This made the replacement process straightforward and hassle-free.Thirdly, performance-wise, these spark plugs have significantly improved my motorcycle's engine responsiveness and fuel efficiency. Whether I'm cruising on the highway or tackling challenging terrains, I've noticed smoother acceleration and consistent power delivery throughout the RPM range.Moreover, durability is another standout feature of these spark plugs. They have demonstrated exceptional longevity, holding up well under various riding conditions and environmental factors. This reliability gives me peace of mind knowing that my bike's ignition system is in top-notch condition.Lastly, the value for money is undeniable. With the NGK 3951 Pack of 8, I received a cost-effective solution that not only enhances performance but also offers long-term reliability and durability.In conclusion, if you're looking to optimize your motorcycle's engine performance with a set of spark plugs that deliver on all fronts—quality, performance, reliability, and value—look no further than the NGK 3951 Motorcycle Copper Spark Plugs (TR55). They have earned my highest recommendation without hesitation. Five stars!

Over all these are doing good so far with only around a thousand miles on them. I've used ngk in the past many times and never had a problem with them. The only thing that you should really know is that like all other plug manufacturers they are pre set to a gap of their choosing and not necessarily the correct gap for your particular engine. These arrived gapped at sixty thousands so I had to adjust the gap down to fifty thousands for my car.

Great spark plugs love it if it not acdelco it NGK make my 97 chevy ride like a new truck will buy again good price will buy again thanks

I installed these in my 2002 Ford Mustang GT. They came gapped at .054". I checked each one to be sure. Its actually my recommended gap so I didnt need to make any adjustment. Easy to install I also used some anti sieze just to make it easy to remove layer. They looked to be a very well put together plug. I believe these will last a few driving seasons. My car idle smooth and had no misfires. The strong pulling was there felt like a new car again!

Boxes came a little damaged. Spark plugs still in good shape installed and works. Price is right

Only needed 4 but 8 was cheaper. Worked perfectly for my old Mazda 6 4 cyl

Great quality. Great price. My 01 mustang gt is running awesome right now.

One broke when the socket slipped, but they are very still good.

Amazing quality and fitted my ford mustang gt 4.6 v8 perfectly. Plug and play

Happy with this product. Fit the truck as advertised . Working well.

The best product, yes, this is what we are looking for, and the price is reasonable

EASY PROCESS FROM PURCHASE TO DELIVERY

These NGK plugs work very well in my vehicle. They are a great product, you can rely on the NGK brand plugs.Would buy again for sure.