---
kind: "section"
citation: "40 C.F.R. § 205.157-3"
title: "40"
number: "205.157-3"
heading: "Configuration identification."
url: "https://uscodex.org/cfr/40/205.157-3"
---

# §205.157-3. Configuration identification.

- (a) A separate vehicle configuration shall be determined by each combination of the following parameters:
  - (1) **Exhaust system (engine)—**
    - (i) **Mufflers; (ii) expansion chambers; (iii) spark arrestors; and (iv) other exhaust system components.**
  - (2) **Air induction system (engine)—**
    - (i) **Intake muffler; (ii) intake ducting; and (iii) air cleaner element.**
  - (3) **Vehicle drive train—**
    - (i) **Chain; and (ii) shaft.**
  - (4) **Transmission gear ratio—**
    - (i) **Standard transmission; and (ii) automatic transmission.**
  - (5) **Cooling system configuration—**
    - (i) **Natural air cooled; (ii) liquid cooled; and (iii) forced air cooled.**
  - (6) Category parameters listed in [§ 205.157-2](/cfr/40/205.157-2.md).
- (b) [Reserved]

## Notes

### Source

Source: 45 FR 86708, Dec. 31, 1980, unless otherwise noted.

### Authority

Authority: Secs. 6, 10, 11, 13, Pub. L. 92-574, 86 Stat. 1234 (42 U.S.C. 4905, 4909, 4910, 4912).

### Source

Source: 41 FR 15544, Apr. 13, 1976, unless otherwise noted.