Will a Car Muffler Make a Generator Quiet?

Recently picked up this generator which had a car muffler installed. I tested the sound output in decibels with the car exhaust and the stock OEM muffler. Does a car muffler make a generator quieter? Visit My Amazon Store: https://www.amazon.com/shop/jamescondon Generator Model# 030230.00 Engine Model# 204412-0147-E1