Audio Systems: woofers, audio speaker, woofer

Question
do u know how to increase the watts of a woofer

Answer
What do you mean by "increase the watts"?

If you want to increae the power handling, there's not anything you can really do to modify an existing driver.  If you have a bigger am than a woofer can take you will either need to purchase a car audio speaker with a higher power handling, or else add additional woofers (being very careful not to change the resistance in "Ohms" across the amp, or else you will blow it up).

Please feel free to follow up with me if you have any additional questions on how to do this, or if you meant to ask something different with your question.