It depends on how you connect it. If two identical woofers are connected in parallel, you can get more power, but it depends on whether the amplifier can withstand it.

If the impedance of both speakers is 4 ohms, and the impedance is only 2 ohms after parallel connection, the output power of the amplifier will be doubled.

If the power amplifier can withstand it, it also depends on whether the speaker space is enough. If it is too small, it will not work, and whether the speaker material is solid enough, otherwise it will not work.

You can also install a larger caliber speaker, such as 12-inch for 15-inch or 18-inch (if the speaker space allows), the effect will definitely be better.

If connected in series, the power will be twice as small and the effect will be even worse.