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If you want to see how much plugs make a difference in idle and tip in acceleration, install the Bosch 3/4 prong plugs, drive 100 mile to burn off all the factory coatings, then install the NGK IRIDIUM IX plugs. I tried just that a few years ago right after I purchased the X5. Did not looking on NGK website ordered the wrong plugs from a vendor due to their miss information. Completely different experience.
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2005 X5 4.8IS
The Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
Last edited by StephenVA; 02-18-2019 at 05:56 PM.
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