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The chrome on a bumper is the same chrome plating that is used on some piston rings, especially on oil rings. While the hardness and durability of chrome has great benefits, it also has some drawbacks - incompatible with Nikasil, harder to break-in, etc...
"Dyno" Don MacAskill from Shaver Specialties Racing Engines and Lake Speed Jr test out Titanium Nitrided rings - the same gold colored coating used on drill bits. The results even surprised these dyno veterans!
For the details on the break-in procedure used in this video, check out this link: • Don't RUIN Your Engine...
For more on "Dyno" Don, check out his blog: www.dynodonnymac.com