Iowa Code » Chapter 321 — MOTOR VEHICLES AND LAW OF THE ROAD
Iowa Code

Iowa Code § 321.436 (2026)

Mufflers, prevention of noise

✓ current as of July 2026
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Every motor vehicle shall at all times be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise and annoying smoke, and no person shall use a muffler cutout, bypass or similar device upon a motor vehicle on a highway. [S13, §1571-m18; C24, 27, 31, 35, §5061 – 5063; C39, §5034.45; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.436] Referred to in §805.8A(3)(ah) For applicable scheduled fine, see §805.8A, subsection 3

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Notes of Decisions
Cited in 5 cases (1 in the last 5 years), 1997–2024 · leading case: State v. Kinkead, 570 N.W.2d 97 (Iowa 1997).
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State v. Kinkead, 570 N.W.2d 97 (Iowa 1997). · cites it 18× “That section provides: “Every motor vehicle shall at all times be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise-” Iowa Code § 321.436 . Miller testified that she heard Kinkead’s muffler clearly despite the fact that…”
United States v. Hephner, 260 F. Supp. 2d 763 (N.D. Iowa 2003). · cites it 4× “” Iowa Code § 321.436 . 3 . The issue of the search of the locked toolbox which was found in the bed of the truck is addressed separately.”
United States v. Jesse James Hephner, 103 F. App'x 41 (8th Cir. 2004). “In this case, the district court credited the testimony of the troopers concerning how loud the pickup truck’s muffler sounded as it passed the troopers on Interstate 80.”
State of Iowa v. Justin Raymond Mann (Iowa Ct. App. 2024). · cites it 4× “Iowa Code section 321.436 requires, in pertinent part, every motor vehicle to “be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise.”
State of Iowa v. Grason Trever Lansman (Iowa Ct. App. 2020). · cites it 2× “There, a state trooper stopped Kinkead for what she believed to be a violation of Iowa Code section 321.436, which prohibits excessive muffler noise.”
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