Originally Posted by DirtyD
I had always assumed the fact that most places that had the hood up for a dyno was just keeping the heat from being trapped under the hood since the car would be under WOT without the aid of airflow across the cat to dissipate some of the heat...never considered that filter padding aspect of it. Even if it's like 2-3 hp. Lol
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Yeah, figured when dynoing they kept hood up to dissipate heat to make it as close to "down the road" temps as possible. I understand we drive with hoods down but we still get air flow that pushes hot air out.