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Pretty sure Focus-AK has about as much of the lower grill blocked with no cooling issues but every car is different. I hope you have a gauge that reads engine temps from the computer because the gauge on the dash is just a glorified idiot light. I still haven't blocked my lower grill but it's on my to-do list when I find time to work on the car. Been thinking about exending the air dam like you did too but was worried about it not being "ideal". I guess it's better than nothing but could be better, but extending thr factory dam is just too easy lol
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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