How to modify the exhaust of Pentium t77 to be more aggressive?

Pentium T77 is quite low-key. Originally, the exhaust pipes on both sides were hidden, and the publicity was not enough. Many riders don't like this kind of exhaust.

It is illegal to modify the vehicle without permission, and you need to submit an application to the vehicle management office. According to Article 9 of the Regulations on Motor Vehicle Registration, those who apply for changing the color of motor vehicle body or replacing the body and frame shall fill out the Application Form for Motor Vehicle Change Registration and submit legal certificates and vouchers.