i havent made any changes to the airflow as of yet but this last weekend the temp's where in the low to mid 70's and the Evolution 58 was running awsome. I ran a vess 24X8 prop and we tached it at 6700rpm and it just impressed the hell ou of me. I will do my best to make up some additional changes to the air flow befor I push the 3D envelope. Ihave to admit the lack of any sag in uplines and the large amount of open space at the front of the coweling had me thinking that this was being cooled enough. I do hang on the prop alot and hope to get this cooling under control.