Denso Iridium Spark Plugs are designed to ignite the air-fuel mixture in the engine cylinder by generating sparks between the center electrode and earth electrode. They employ an iridium alloy for the center electrodes and provide superb ignition performance. These plugs have lower fuel consumption and higher acceleration performance as well as stable combustion during idling, which contribute to the cleaner exhaust.

#long lasting (2010-07-19) I have been using iridium since 2001 on my civic. I saw quite a few comment about lifespan of the plug. My denso iridum on the box said good for 250000 miles, and my civic is at 260000 and still running swell. So they do last long, unless they reduce the quality so denso can make more $$.

#don t hesitate to buy this one (2010-07-11) If you look for quality, don t hesitate to buy this one. Frankly, when I fixed it (all pack) I felt that my car s engine worked smoother.

#Best spark plugs (2010-06-25) I tried some slightly lesser iridium ones in the past, but this one beats them all. For both of my cars (a Nissan and a Suzuki) the engines instantly ran/sounded better. The Suzuki ( 04) hasn t really shown any improvement in the gas mileage, but the older Nissan ( 97) now gets about 2 miles more per gallon.

#Good product by Denso (2010-05-04) I have used those spark plugs in my 2008 Chevy 1. 6 L Aveo with 10. 000 miles. I have noticed that the engine runs smoother. I haven t made detailed counts but I think that the gas millage doesn t increase significantly, but yes It does

#Awesome deal on high quality plugs! (2010-04-27) I recently bought a set of 6 Denso IK20 Iridium spark plugs for my girlfriends jetta vr6. They were a direct replacement of the oem s and installed smoothly. The car desperately needed a new set and now runs great. Awesome price and free shipping is nice too.

Bosch Platinum IR Fusion spark plug has an iridium and platinum fused center electrode with surface air-gap firing delivering optimum horsepower, better than OE iridium plugs.

#Perfect Plugs in my Impreza (2010-01-24) These have been running strong now for 30,000 miles. They start the car 1-crank faster and have not given me any trouble. Fuel economy is what it should be as well. I will purchase these again when they are worn. Finally, a good spark plug from Bosch!

#victor (2009-06-28) I ordered Bosch 4501 Platinum IR Fusion Spark Plugs through Amazon and everything went perfect. They were delivered on time I installed them on my Mercedes and it made a great difference in the performance of the car. The price was great I recommend Amazon Bosch 4501 Platinum IR Fusion Spark Plug , Pack of 2 to anyone they re superve and you will notice the difference immediately.

#Bosch has arrived with the 4501 (2009-05-23) 3days and 350 miles on these and the VR6 Jetta has new life. Runing strong, full o pep. Code 411 has not returned after clearing code with new plugs. Have not studied mileage yet, but looking to increase for sure. Expensive yes, but great peace of mind in having these.

#Good Plug - However, No Noticeable Fuel Mileage Increase (2009-03-06) I have two Toyota Camrys. A 2004 SE and 2006 LE. Both have the same 4 cylinder engine. I have always been religious about checking the gas mileage on my cars at every fill up because this relays to me if anything has gone awry. The 04 had 115,000 miles and the 06 had 45,000 when I replaced the plugs. I replaced them mainly to see if it would help the fuel mileage, unfortunately for me, no difference. I m sure they are good plugs as Bosch is well known for their high quality, however next time I will probably ...

#more MPG (2008-10-20) i placed this spark plug in my 2002 misubishi lancer and increased its MPG from 29. 5-34 MPG and thats about 4. 5 MPG increased. highly recommended product.

Denso Iridium Spark Plug Denso s Iridium power spark plugs help your vehicle achieve unparalleled performance. It alters the belief that a mere spark plug can add power and mileage. This is done by combining an ultra-fine 0.4mm diameter Iridium center electrode with a tapered cut U-groove ground electrode. Iridium conducts electricity better than platinum, however what makes it exceptional is it s also 6x harder and 8x stronger than platinum. This ultra-fine iridium center electrode provides superior ignition performance during acceleration and top cruising RPM. The U-groove ground electrode creates a larger, brighter flame kernel. The tip of the ground electrode has been tapered which further improves firing performance by reducing quenching. All of these features combine to give more horsepower to your motor. Technical Specifications - 14mm Thread, 19mm (3/4) Reach, 5/8 (16mm) Hex Size, Gasket Seat, Resistor, Removable Terminal, ISO height, 0.4mm Iridium Center Electrode, Tapered Cut...

#Best choise for the toyota corolla (2010-07-24) I bought four of this and replaced the old plugs on my 2003 toyota corolla le 94k, they work perfect. Do not buy any platinum plug, cause the OEM plug is Ir,the OEM plug is Denso SK16R11 or NGK IFR5A11, the old plugs in my car are SK16R11, but I also see some one have NGK in their corolla on the BBS, I guess just Toyota use different OEM parts in different time. you can buy the OEM one, they last longer. but change to IR16 can increace the performance a little bit(Due to the instruction on the Denso s website).

#5 star product (2010-05-31) I own a Civic LX 99 and this product made my engine start quicker and run smoother I had NGK before installing this! I will definitely be buying it once again except if Denso come up with better ones :-) (I highly doubt they will)

#excelentes bujías (2010-04-26) muy buenas bujías, excelente calidad, se siente mejora en el arranque e ignición, se recomienda este producto totalmente

#Power, better engine performance (2010-02-15) Since the spark plugs on my mountain mitsubishi lancer 2. 0 felt the difference of the normal wax candles. The originals were in very good condition. The engine now works with better performance at low and high revs, its response is faster, with the same fuel have more power and smoothness of motor. Si you want to save fuel will have to learn to dispense their management style. Excellent product 100% Japanese. The manufacturing quality is perfect. After thinking about purchasing this or another brand spark plugs and less if they are no...

#Iridium Plugs have not increased my fuel mileage/economy (2009-10-25) I bought a set of 6 for my Acura RL to replace the factory laser Platinum plugs. The first week after the replacement, my gas consumption increased from 22mpg to 20mpg. I attributed it to a cold spell that had come by in early October. The second week, it went back to 22mpg. I checked it this week and it has gone back up to 20mpg. I don t know where people are getting the improved gas performance from. I have not seen any difference between the 99k old laser Platinums and these 30 mile old Iridiums in perform...

Bosch Platinum IR Fusion spark plug has an iridium and platinum fused center electrode with surface air-gap firing delivering optimum horsepower, better than OE iridium plugs.

#Terrible Packaging (2010-06-08) I rate this as poor as I just received the spark plugs five days late and the box smashed and half open. It looked as if a truck drove over the small box? It was a wonder I got all eight plugs and was very disappointed in whoever packaged these plugs as it was the worst I eve have seen. There was no protection if the shipping box was damaged. I have waited and waited for these plugs and when I get them, they are smashed. Not bad plugs, but terrible packaging and makes me wonder about Amazon.

#Spark Plug (2010-05-20) I really liked the idea behind four electrodes. A bit pricey but with the rebate it made it a no brainer.

#Great Plug, Great Service (2010-05-10) Product arrived before promise date. Already knew how great the Bosch +4 Plugs were, and the IR Fusion plugs carry on the excellence.

#great plugs w/two dollar rebate thru end of 2010 (2010-03-23) purchased 4 of these for my RAV4 with 110k miles. Don t track MPG but I do drive 100-250 miles per day for work, gas tank does seem to need less filling.

#Mixed bag (2009-09-12) I purchased these on the advice of a friend. They are replacing NGK Iridium IX spark plugs at around 90K miles on them. The NGK plugs went from the correct gap setting of . 044 to . 058 and had some signs of rust, it was time. They were being placed in the my 2002 Honda Odyssey which has 168K miles. First off, these plugs are more fool proof to install since there is nothing to gap. They are suppose to get more spark at the tip due to the 4 electrodes. The end result is a mixed bag. I was really expecting my milage to go up a little like after the last ti...

NGK Laser Iridium Spark Plug is manufactured to provide superior ignitability. It is constructed from durable material that is corrosion and abrasion resistant. This spark plug features smallest tip diameter. The iridium, platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions. It ensures longevity and can be easily installed.

#BMW HP2 (2010-07-03) My HP2 was idling rough and the throttle response wasn t smooth. I installed the NGK s and the engine improvement was immediate.

#the best (2009-09-30) These spark plugs are among the best, they last the longest and never foul. the shipping is a little slow but worth the wait