thanks for all the info... theres a lot to consider. I have never had to do any of this...
How are those fin baffles attached and is that wood Windsurfa?

@Rbean thank you so much, you have convinced me to do an airdam, what material did you use there?
Im not sure I nmeed to duct air back to the top, but would you suggest opening up the firewall to allow air through. wouldnt this create a low pressure in the fuse, drawing air into the cowl from the opening where I am now planning the air dam?

Thanks