ohms help please

i dont think there 12 ohms.  i dont think mtx offers the 12" in 12 ohms. i know they offer the 10" in 12 ohms. this is driving me crazy because i had a fosgate 500a2 its like 7 years old. i replaced it with the hifonicks and i think the fosgate amp hit harder. any light on this situation. thanks!!!!!!

As far as I know all the MTX pre-fab three-driver systems use their custom 12-ohm speakers.  I am not sure if they sell these seperately.  The Punch amp is rated at 500 watts into 4-ohms when bridged, so it delivered 150 more watts than the Hifonics is capable of.  The Hifonics is a cleaner amp most likely, but it is not as powerful into a 4-ohm load.  Sorry. Support the12volt.com

i pulled one sub out it said 8 ohms on the sub. witch according to the caculator it comes to 2.677 ohms. witch then means my amp is pushing 750 watts. but then why would my 500 fosgate hit harder any light on the situation?

That would be 750 for 2 ohms, not 2.67 ohms, according to your earlier post.  Figure less wattage accordingly.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.