{"data":{"id":"us/40-cfr-205.157-3","jurisdiction":"us","citation":"40 CFR 205.157-3","heading":"-3 Configuration identification.","body":"(a) A separate vehicle configuration shall be determined by each combination of the following parameters:\n(1) Exhaust system (engine): (i) Mufflers; (ii) expansion chambers; (iii) spark arrestors; and (iv) other exhaust system components.\n(2) Air induction system (engine): (i) Intake muffler; (ii) intake ducting; and (iii) air cleaner element.\n(3) Vehicle drive train: (i) Chain; and (ii) shaft.\n(4) Transmission gear ratio: (i) Standard transmission; and (ii) automatic transmission.\n(5) Cooling system configuration: (i) Natural air cooled; (ii) liquid cooled; and (iii) forced air cooled.\n(6) Category parameters listed in § 205.157-2.\n(b) [Reserved]","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER G—NOISE ABATEMENT PROGRAMS","PART 205—TRANSPORTATION EQUIPMENT NOISE EMISSION CONTROLS","Subpart D—Motorcycles"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"e1f40077875c5369eb9b7a27304d4f6a4d3364b6980c9ae707d1b37c39f054a8","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-205.157-2","next":"us/40-cfr-205.158"},"notice":"GroundRules: Original legal text. Not legal advice."}