Just before you decide to get rid of them, why don't you try this simpler step. Don't worry about the mod, instead cut a piece of black electrical tape, just slightly bigger then the back ports for each of the pistons. Cover the ports in the back! Now, sit back and enjoy -tighter bass, clearer mid and highs. Maybe this is what your looking for? -Just my guess. Others complain the bass might be overwhelming, but the ports actually create the full-bodied sound and the soundstage many are accustomed to with the pistons. But, others may want a well balanced signature. So, you can try this at no expense.
Bye the way, you can also purchase round stickers at a stationary store, radio shack, or accessories section at pep-boys, Wal-Mart, etc..., to make the pistons look nice from the back. Do not use clear tape (scotch tape), or paper-back tapes. For, these are to weak for this project.
-Hope this was an easier alternative for you before deciding to get rid of them.
Edited by 1clearhead - 5/25/14 at 7:04am