Thanks for your input everybody. Looks like I'm stuck with the stock stuff!

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2002 E53 X5 4.6is, Titanium Silver Metallic, Black leather/wood grain interior
2004 Dodge Durango, 5.7 Hemi, pretty much stock (except for Scat rods and SRT8 camshaft)
2008 Ford F-350, King Ranch, 6.4 PSD, CCSB