Think I may have found what I will use if I do need to actually replace my horns. Actually has a deep tone compared to all the other replacement horns out there.
PIAA superior bass horn (330Hz/400Hz) - YouTube
Amazon.com: PIAA 85115 Superior Bass Horn: Automotive
PIAA superior bass horn (330Hz/400Hz) - YouTube
Amazon.com: PIAA 85115 Superior Bass Horn: Automotive