[Code of Federal Regulations]
[Title 40, Volume 15]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR85.504]

[Page 519]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 85--CONTROL OF AIR POLLUTION FROM MOBILE SOURCES--Table of Contents
 
     Subpart F--Exemption of Aftermarket Conversions From Tampering 
                               Prohibition
 
Sec. 85.504  Applicable standards.

    (a) The emission standards applicable to conversions of 1993 and 
later model year vehicles and engines are:
    (1) All of the requirements that would apply if the conversion were 
being certified as if it were a new vehicle or engine.
    (2) If a vehicle or engine to be converted was originally certified 
to a NOX or particulate family emission limit other than the 
applicable new vehicle NOX or particulate standard, the 
family emission limit is the applicable standard.
    (b) The emission standards applicable to conversions of 1992 and 
earlier model year vehicles and engines are:
    (1) Exhaust hydrocarbons (as applicable by fuel type). The Tier 0 
hydrocarbon standards, as applicable by vehicle class, contained in 
Secs. 86.094-8 and 86.094-9 of this chapter, and the hydrocarbon 
standards, as applicable by engine class, contained in Secs. 86.094-10 
and 86.094-11 of this chapter;
    (2) CO, NOX and particulate. The applicable CO, 
NOX and particulate standards or NOX and 
particulate family emission limits the vehicle or engine was originally 
certified as meeting;
    (3) Evaporative hydrocarbons. Any evaporative requirements 
applicable to the original vehicle or engine will remain applicable to 
the conversion if the converted vehicle or engine retains the ability to 
operate on the fuel which it was designed and certified to use.