Customer Reviews

Bosch (4509) HGR9LQI0 9 Platinum IR Fusion Spark Plug, Pack of 1

5 star:		(9)
4 star:		(2)
3 star:		(0)
2 star:		(1)
1 star:		(1)

 

 

As always Bosch products are great. BUT the shipping from this store leaves a lot to be desired!!! We ordered a set of 8. It took 4 shipments to receive all 8 Some were out of the boxes, some were packed in envelopes, some did not have any protective material around the electrodes. NEVER AGAIN!!!

Installed in a '04 2500HD silverado 6.0l gas. Have noticed an increase in fuel effiency. no knocks or pings. i did also change out my wires at the same time.

I saved at least $20 with purchasing four of these items via Amazon.com. Product arrived fast and safe. Hassle-free installation. Definitely worth the money.

I put these into my Focus and could see an immediate improvement. I probably change my spark plugs more often then I need to, but better early then late. So far they seem to be out performing my old plugs with 60k miles.

Have used and reccomend the +4's for some time, have them in a 3/4 ton GMC right now - and yes I definitely notice some extra crispness to my acceleration and performance with these plugs. Went with the Iridium center electrode this time, as the platinum center electrode plugs only get me about 50k miles before starting to show significant erosion. The performance bump and cleaner burn are worth the extra cost, as far as I'm concerned.

I installed these plugs with MSD wires on my 2001 Silverado 5.3. Of course, you don't really notice a power increase from changing plugs & wires, but what I did notice was no more pinging at high rpm's. My truck has 280,000 miles and I had about 150,000 miles, or so, on the Delco plugs / wires, so I'm sure I was overdue for a change. Still in all, I'm very satisfied with the purchase, as well as, the vendor I purchased from. I couldn't have asked for better prices or faster shipping.

My 2005 Chevy Silverado w/ a 5.3L V8 and both a Cold-Air Intake and a Flowmaster Exhaust system is running better then ever! My truck feels like a beast when its going up the freeway ramp and roaring up any hill. I installed these spark plugs and MSD spark plug wires when my truck hit 100k.

Instant and HUGE increase in speed control acceleration etc. car runs like it's 5 years younger. Buy these.

As I age, less is more. The plugs do not requre gapping! My son installed these and the volant air system, what a difference. Power, idling, and launching my 5800 pound truck. Altough the truck is not a green truck, installing the plugs and air system increased in town from 11.4 to 13.1 or so. Set and forget!

Had my mechanic put these plugs in my 2003 Hummer H2 with 102K miles on it. As soon as I drove off the truck felt very sluggish and when I tried to accelerate it hesitated and had no power. Brought it back to my mechanic and he said it was misfiring on 6 of 8 cylinders. Replaced the Bosch plugs with AC Delco iridium and no misfires. For some reason they just didn't work in my Hummer.