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The pioneers DO mount to the bass reflex port with the 5 1/4 holes.
However the sound on a stock setup will suffer. The 6.5 speakers with the tuned bass reflex housing completely drops out the low end (the enclosure is no longer sealed/tuned), and because it doesnt seal perfectly to the enclosure like the 5.25 speakers, you get all sorts of weird air sounds when playing music. I also tried sealing the lip of the 6.5 to the 5.25 opening and the air no longer escaped, but the enclosure still completely screws up the sound(no low end, hardly any mid). I don't know how the OP had good results, unless he didnt have bass reflex housings and also paired the speakers with a 4ohm HU.
All of this is in addition to halved output power if you stick with stock amp and HU. Plus, the linked pioneers are coax, which if you want higher range in the doors is great, but if you want mid/sub woofers in the doors, dont get them.
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