As a former teenager that liked straight pipe everything, I had a 1.3L Festiva that I straight piped, it was loud, loved it until I drove it on a 500 mile trip, got home and put muffler back on it.
My point, ya might want to leave muffler on for passenger comfort to the ears so they won't leave you a bad review due to noise of exhaust.
Just stating what I have experienced, but it is your vehicle to do with as you please, happy ecomodding!!!
