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Your cart is empty.Genuine 4 pack NGK Iridium IX 3521 Spark Plug
willytv
2025-09-03 17:40:41
These are high-quality genuine NGK plugs. Delivery was fast and price was very competitive…
John J.
2025-08-28 13:31:08
I have been using these plugs in my bikes truck and snowmobiles since they came out. They are the best, starts easier, crisp throttle response, never fouled one either. A+++
Trevor
2025-08-04 14:02:57
Best iv ever bought
Lou
2025-07-22 19:06:56
best spark pugs available
John
2025-06-13 16:25:37
Good
Jair
2025-06-02 10:32:27
Bien bien
Toldja
2025-05-24 12:50:03
As described
Mike H
2025-05-12 20:46:16
Even though Amazon says they aren’t compatible, they work great with my 2020 FLHXS. I used the Bosch website to find the correct part and ordered through Amazon.They all came gapped at 0.032 inches, so I left them alone. Didn’t use anti-seize since the Harley service manual doesn’t call for it, and torqued them down to 100 in-lbs.I’ve put about 1,000 miles on them and I’ve noticed about a 15% increase in fuel mileage. It’s hard to say if I gained any more power since it had plenty of power to start with. My fuel mileage went from about 40 mpg to 46 mpg, depending on how I ride. My bike has about 45,000 miles on it and has a simple Stage 1 with the Screamin’ Eagle tuner.
Stewart
2025-05-01 18:50:16
Good item would buy again
Stuart Robertson
2025-03-24 12:53:36
Perfect, just as advertised no issue good product
Ian ScrimgeourI
2025-02-10 12:44:53
Plugs were perfectly packaged for overseas shipping. Arrived in expected time frame. Price was better than expected. Great company to deal with as they supplied timely ongoing updates of processes right up to delivery.Many thanks ðŸ‘
Sisel
2025-02-03 13:12:19
Bought for Yamaha jet ski , worked as stated
lebreton christian
2024-12-19 15:30:40
Bougie très bonne qualité haute performance
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