Here is a before and after of my 91 Civic hatchback with Stock Exhaust to Yonaka Exhaust.

Before Setup:
- All Stock

After changing Yonaka Exhaust:
- DNA Highflow Test Pipe (HFC-HC88)
- Yonaka Catback Exhaust - Link: https://www.yonaka.com/88_91_Civic_3D...