Yes they do work, but not you're not going to feel a difference. The difference is minute, only a few HP.
-Grim
2003 Sunset Metalic Orange H2 - Breathless Stage 2B, HID's, Gobi Rack & Ladder.
2003 Millenium Yellow Z06
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2004 Black Silverado SS
2003 Millenium Yellow Z06
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