Pursuant to the provisions of 39:3-43, the use upon any motor vehicle of a straight exhaust pipe, or a muffler or mufflers lacking interior baffle plates or other effective muffling devices is expressly prohibited.
N.J. Admin. Code § 13:20-4.4
See: 45 N.J.R. 842(a), 46 N.J.R. 103(c).