Hi all, looking to pull apart my forte 18's and build new woofers. I'd like to upgrade to a 4 inch dual 4 voice coil, 9" spider, carbon fiber cone/dustcap and high roll surround. I'd also like to upgrade to a larger magnet. Any suggestions for parts and why would be greatly appreciated. I'd like to build something capable of some serious power handling. I plan to use these for competition. Open to using neo motors. Thanks!