A twelve fits nicely without getting into structure. Any bigger (15") you'll need a different order of enclosure and blow it thru a port. The key is to measure 5 times before you cut. I used a long six inch drill bit (1/8th dia) to make a pilot hole in the center of the speaker cutout and go thru the cab AND bed for perfect alignment. I bought a body saw at HB for $30 and it makes it super easy to cut and control. I can always tig the piece back in if I need to.
I bit the bullet and updated my 15 year old equipment (which sounded good) until I listened to the newer digital class D mono amps and high excursion subs. The old technology just can't compare. Twice the power and clarity and half the amp draw.
It shakes things for sure. I've been into high end audio since I had my first car at 16 so I can't separate the love of sound from the love of squares. I am more than happy with the outcome.
The accordion boot is the ticket. It seals the cab-bed perfectly! Now I just got to pull to box out and get it LineX'd and put it together for the final time.
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That's the way I was always gonna go if I did a blow through, there's no better way especially with the cab vs box deflection. I started at 16 as well, I remember my first head unit... I thought it was rocket science as I had just done mechanical things my whole childhood. I look back now and laugh at myself lol.
I agree as well I'm young enough where i got into car audio once the big transition and popularity came into swing again. So I got to get a taste of the old low end stuff and blow those things up and by the time I learned a little bit about setting up amps correctly lol, the high quality new tech was kicking off.
That's when I picked up my FI audio bl15(discontinued now lol) I've blown many small amps trying to get every bit out of this sub and I was a kid so I was blaring it driving around for 5 hours a day lol. I picked up that old 90's amp from a buddy and it lasted at least 3 more years, it bumped the hardest. But the last few years the old age got to her, she went up in a smoke show lol.
i ran kicker subs and amps, even the square ones! I just thought those were neat. I've ran Rockford, and random off brand stuff as well, they were ok but nothing like the sub and equivalents from other companies. These new subs are insane, I think mine was 64 or 65 pounds, huge dual magnets, heavy basket, replaceable cone.
The sub is ready for another amp though, never had a recone, I could never say enough good things about FI audio. I've been looking at crescendo audio for a looong time, particularly the bc series, they're out of stock as of right now. Im going to be able justify getting a crescendo amp if the government pays for it lol, either way I'm done buying cheap amps.
Anyways enough of my rambling, I agree with you about the audio. Once you've gotten into custom audio you can't live without it, no matter what you drive. I'm somewhat of a purist, but I have no hesitation putting a nice single din kenwood head unit in any of my squares, now and in the future, other than my grandpas truck.
Nice build man, looks clean and I hope it sounds good! Don't let anybody give you **** for it! I would do it too! Not many squares out there with a blow through setup!
So, bringing back an old thread or trying too. 
