hi, i am building a box for a single 12" sub and it ls gonna be ported. i was wonderin if i could build the vent around inside the box, like people get those snake ports, i wanted to do this so i could achieve a better frequency tuning cause sometimes it calls for a port that is just too long, i was wonderin if it would affect it if i put some 90 degree turns in the port to achieve the proper length. will this work, has anyone done it?