Emissions inspections are required for vehicles when vehicles are registered or when registration is renewed.
Diesel Vehicles:
Required for all diesel vehicles manufactured after 1997
Exemptions:
1. New vehicles for the newest seven (7) model years
2. Pre-1968 model year vehicles.
3. Vehicles with a GVWR of more than 8,500 lbs
For more information visit: https://www.dmv.de.gov
Delaware Code
Title 11 § 4311. Mufflers; cutout prohibited
(a) No person shall drive a motor vehicle, including a motorcycle, on a highway, including residential streets, unless such motor vehicle or motorcycle is equipped with a muffler in good working order and in accordance with manufacturer's specifications and in constant operation to prevent excessive or unusual noise.
(b) No person shall use a "muffler cutout" on any motor vehicle upon a highway.
(c) It shall be unlawful to sell or offer for sale any muffler without interior baffle plates or other effective muffling devices or to sell or offer for sale any "gutted muffler," "muffler cutout" or "straight exhaust."
(d) The provisions of this section shall only apply if there is not a violation of § 4311A of this title.
Title 21 § 2197 Street Rods
13) Exhaust systems--Every street rod shall be equipped with an exhaust system that is free of leaks including the exhaust manifolds (including headers), the piping leading from the flange of the exhaust manifold(s) and the tail piping.
Exhaust systems on street rods shall discharge the exhaust fumes at a location to the rear of the vehicle body or direct the exhaust fumes outward from the side of the vehicle body at a location rearward of any operable side windows. No part of the exhaust system shall pass through any area of the vehicle that is used as a passenger carrying compartment. Every street rod must be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise. Muffler cutouts or mufflers without internal baffle plates are prohibited.
Antique
Available for vehicles that are more than 25 years old that have been maintained in or restored to a condition that substantially conforms to manufacturer's specifications, and which may be used only for participation in club activities, exhibits, tours, parades and similar uses and not for general transportation. $25 fee for Antique Status.
YOM
Allows for the purchase of replica YOM license plates through the Delaware Historic Plate Company. Hobbyists should review the guidelines on the Delaware Historic Plate Company website before purchasing a replica plate.