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Old 01-16-2012, 10:44 AM   #4
JDP Tech

 
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Drives: 2010 CGM Camaro 2SS/RS 429 LSX/F1X
Join Date: Aug 2011
Location: Sandy, UT
Posts: 427
Not at all, in fact there is probably a very slight improvement in performance, without the cover the intake will stay cooler, which means cooler air, which means better performance.
With the cover it will keep the manifold warmer, which would help in getting to operating temperature slightly quicker in case you drive it in cold weather, but really you wouldn't notice anything different going either way.

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