any one w/ half a brain plz help- cut through?

[Puff the dragon 10+ year member]

I have a 99' Dodge Dokota R/T regular cab with 6 MTX 8000 series 12's and 3 8100D 1500w amps in the bed. I have a 8" x 40" cut through in the cab but since they are 12" subs, they are pounding on the sheet metal of the cab and about half the sound is getting through to the dash. I can't really cut any higher because of wire harnesses from the factory. Help me out if you got any ideas, I am only hitting 148! With 6 12's it should be a bit higher.

Thanks

jesseborgelt@hotmail.com[/email]

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[jrmax 10+ year member]

I am not sure I am reading this right but I have no audio knowledge really compared to you guys but I would build supports in where the cut is say every 10" but a verticle post!