I have a 2008 hยณ 3.7L Hummer with manual transmission. After installing the spacer, I was concerned about an erratic idle that would stall when the clutch engaged. RPMs would sometimes climb to 3k and flatten out at one point. I've noticed that it settles down a bit as it nears 100 miles travel time. In terms of power or throttle response, I notice better performance, but not by much. Update: I removed the damn thing.
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