Bosch(9602) HR8LII33U Original Equipment Fine Wire Iridium Spark Plug (8 Pack)

These work well in a 2004 GMC Sierra 5.3 SLE , Engine runs quiet and smooth

Truck started.. not much else to say

My '07 silverado has 260k on it and was not dropping into V4 mode and was sliding on the L/100. First drive after these were in was great, the V4 mode was on most of the time I was in cruise and the readout was hanging around 11 instead of 14L/100. After these ones hit the end of the road, I'll get them again.

Bonne performance

Improved my engine's performance drastically. Much better gass mileage. Bitch to install on one side.