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OK, so to gain 20hp from your mazdaspeed 3 heres a simple mod.
"According to a dyno test done at BEGI in Texas just three hours before I wrote this,
simply opening the airbox lid on a Mazdaspeed 3 gains 20hp." -dave/eyesoreracing
Kay, so I was a little skeptical when i tried this but i kinda feel the power. Oh yeah, and the stock BOV is loud as shit now!!!
i just unhooked the metal latches to the air box, kinda gave it some room to breathe and thats it.
So as i accelarate, i noticed a little more power, then in second... psshhhh
if someone can tell me how much power is gained from this id appreciate it
go try it

"According to a dyno test done at BEGI in Texas just three hours before I wrote this,
simply opening the airbox lid on a Mazdaspeed 3 gains 20hp." -dave/eyesoreracing
Kay, so I was a little skeptical when i tried this but i kinda feel the power. Oh yeah, and the stock BOV is loud as shit now!!!
i just unhooked the metal latches to the air box, kinda gave it some room to breathe and thats it.
So as i accelarate, i noticed a little more power, then in second... psshhhh
if someone can tell me how much power is gained from this id appreciate it
go try it