Wisconsin Motors Canada - Noise Levels & Exhaust Back Pressure

Sound Pressure Noise Levels & Exhaust Back Pressure

While a 2 or 3 decibel change in noise levels between different muffler options may not seem significant it is important to remember that for every 3 decibel change this represents a 50% reduction or increase in noise levels. All measurements have been taken in accordance with SAE J1074 at maximum rpm and 100% load. A load of 80% was used for back pressure readings.

Engine Model	Muffler Part #	Noise Level db(A) @ 50 ft (5.24 meters)	Noise Level db(A) @ 50 ft (5.24 meters)	Noise Level db(A) @ 50 ft (5.24 meters)	Back Pressure 100%	Back Pressure 80%
AENLD 3600 rpm 9.2 hp 23 c.i.	Bare WD66A WD45 WD104	82.87 76.87 75.93 78.34	89.12 81.90 80.93 83.68	104.4 96.43 96.15 99.0	NA 8.4 7.0	NA 6.8 8.0
THD / TJD 3600 rpm 18.2 hp 53.9 c.i.	Bare WD98 WD44 WD89	89.09 80.50 74.40 75.59	94.53 86.34 79.75 80.84	110.53 101.71 95.03 95.65	NA 13.5	NA 10.5
VH4D 2800 rpm 30.0 hp 107.7 c.i.	Bare WD98 WD86 WD44 WD58A WD89	87.0 80.9 78.6 77.65 79.21 78.06	92.81 87.06 83.56 82.93 84.78 83.71	107.12 101.25 97.12 96.71 97.87 97.37	NA 3.0 12.5	NA 1.5 7.2
VG4D 2400 rpm 37.0 hp 154.0 c.i.	Bare WD101 WD58A WD49 WD83 WD90	88.31 79.03 79.62 80.37 76.71 76.43	94.59 84.84 84.15 85.37 82.00 81.78	108.43 98.18 84.15 85.37 82.00 81.78	NA 23.0 12.7 10.0 19.5	NA 13.6 8.1 6.5 14.0
V465D 3000 rpm 65.9 hp 177.0 c.i.	Bare WD58A WD67 WD83 WD90	89.31 82.56 79.63 81.34 80.75	95.56 87.68 85.25 86.31 86.25	109.4 100.59 99.21 100.03 99.62	NA 13.6 23.7 20.6 44.5	NA 8.9 16.5 13.0 25.8

NA - not applicable

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