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Reading the regulations as they stood on September 30, 2011. Current text may differ.Switch to current
Current textIn force on Sept. 30, 2011Source: annual CFR editions 1996–2016

§ 325.51 Scope of the rules in this subpart.

Current wording, first on file in the 1996 annual edition.

govinfo, 2010 edition ↗
Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2010 edition's wording. An amendment that took effect between Oct. 1, 2010 and Sept. 30, 2011 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.
49 CFR § 325.51 — Scope of the rules in this subpart.. Text in force on September 30, 2011. This wording effective October 1, 1996 to present. Source: govinfo, 2010 edition, https://www.govinfo.gov/app/details/CFR-2010-title49-vol5/CFR-2010-title49-vol5-sec325-51. Retrieved from FMCSR.com, https://fmcsr.com/reg/325.51?asof=2011-09-30, on October 26, 2026. Unofficial compilation; verify against the official source.

(a) The rules in this subpart specify conditions and procedures for measuring the sound level generated by a vehicle when the vehicle's engine is rapidly accelerated from idle to governed speed at wide open throttle with the vehicle stationary, its transmission in neutral, and its clutch engaged, for the purpose of ascertaining whether the motor vehicle conforms to the Standard for Operation Under Stationary Test, 40 CFR 202.21.

(b) The rules in this subpart apply only to a motor vehicle that is equipped with an engine speed governor.

(c) Tests conducted in accordance with the rules of this subpart may be made on either side of the vehicle.

Amendment history

1 distinct wording on file since Oct. 1, 1996
  1. Oct. 1, 1996 → presentannual editions 1996–2016viewing

A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section.