BOSCH 4309 HGR9LDP0 9 Platinum+2 Spark Plug - Single

I used these in my 2004 Silverado with a 4.8 a few years ago for the 100,000 mile change and they seemed better than stock and have been going strong for 90k, its about time to change them again and I will definitely use these. I recently added a 2003 Suburban with the 6.0 and 160k that still had the factory plugs, talk about a night and day difference. I can't say how much better they might be than stock but they work and for the price its worth it to me.

no issues - a good product. easy to install. better gas burning. I wish I did not have to write so much...

Perfect fit, comes with new screws and works fine. Good price on Amazon as well. No problem installing it and the supplied screws were a nice touch.

No standard plug will give you back as this much power back. Wow By far the best plug you can buy. Very well in increased power off the get go. And the engine runs smoother. I highly recommend this plug in any engine. Get rid of those OEM plugs right away. This deserves credit for money well spent. And that alone will get you better gas mileage. So way have the standerd plug when these can save you alot more in the end.

Used these with Bosch wires on my 2002 Silverado 5.3l. I just recently noticed 3 of the 8 plugs were moving while the engine was running. I check and they weren't even finger tight. I set them with the correct torque at installation. They've been in for a few years so who knows how long they've been like this. From what I've read now this is not uncommon with Bosch plugs. The nuts on the ends of the plugs had even worked their way loose and were stuck in the wires. (See picture) I'm going back to AC Delcos. I've smelled a bit of gasoline and heard what i thought was lifter noise for a while now. Turns out it was all because of these loose plugs. Everything is fine now that they've been replaced. I'm curious to see how my MPG is now.

Great plug when installed with Accel ignition coils and ceramic bootef plugs

My 05 chevy runs much better, haven't been able to run the mileage yet by sounds like she'll get 18 or better like it used to average

Great buy! Worked good