Installing a muffler on a dump truck

Installing a new muffler on a 1987 Ford F800 dump truck with a 7.8 Ford diesel motor.

Tools used

Angle grinder: https://amzn.to/2M5tmy4
Welder: https://amzn.to/2M9dZDW
1/4 impact: https://amzn.to/2M8BVHq
1/2 impact: https://amzn.to/2KBNWAi
chop saw: https://amzn.to/2nlqDS2
4" band clamp: https://amzn.to/2vp1ies
floor jack: https://amzn.to/2MaobvT
decible meter: https://amzn.to/2M0uHpQ
Tshirts: https://www.ebay.com/itm/183390302680

Noise Level (dBA) Maximum Exposure Time per 24 Hours
85 8 hours
88 4 hours
91 2 hours
94 1 hour
97 30 minutes
100 15 minutes
103 7.5 minutes
106 3.7 minutes
109 112 seconds
112 56 seconds
115 28 seconds
118 14 seconds
121 7 seconds
124 3 seconds
127 1 second
130–140 less than 1 second.