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Hello,
The grill block might be more effective if it was flush on the outside?
I drove a ZX5 just prior to my xA. Mine was a 2002 manual. You are doing very well -- I think I got about 28.5 once in a while...
The grill block on my xA (also on the upper grill) had no affect on the temperature. My ScanGage is typically around 184F, on hot days.
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