So many people telling him it's not a bad thing ?!!! Wow !
don't do it, OP. Don't talk about SQ when all you want is something loud tha can sound good.
Maybe, as someone said, you need some better midbass speakers in your front stage.
And yes, 29 is really low ! I tune my box around 34 Hz, and it's low enough for my musical taste. I used to tune around 32, but 34 is better for me now ! shorter port, less gross volume, and still got the lows ! (my car has a small hatch area).