I have a 2004 manual RX8 and i am wanting to do some mods. Which would be the best bang for my buck, open air intake or heads? Thanks.

 

In terms of intake there really is not much benefit unless you get the AEM or similar. If its in the bay then you will be drawing in bay heat and probably losing power. If you get the AEM or similar you will have to watch for puddles and heavy rain. You do realize that rotaries dont have heads right?