6. Tuner Category - Exhaust
In Tuner Category, you can do anything you can in Sport Category, but now you can also replace the header, down pipes header(s) or downpipe(s). The Catalytic Converter can be replaced, but there are limits on what you can do and where you can put it.
Remember though, making sure it is safely installed and you stay in line with federal laws and track noise limits is up to you.
1. Exhaust manifolds, headers, downpipes, and associated EGR tubes may be replaced with alternate units. Exhaust exit may be relocated provided it meets safety requirements. Relocation of the oxygen sensor on the header is permitted. Exhaust heat shields which cover only, and attach solely to, these parts may also be replaced, removed, or modified. All other exhaust heat shields may be modified the minimum amount necessary to accommodate allowed alternate exhaust components. Mounting brackets/hardware which serve no other purpose are considered part of the exhaust components.
2. Catalytic converters – Any catalytic converters are allowed, provided they meet the following restrictions.
A. Catalytic converters must attach within 18” (457.2 mm) of the original unit.
B. Multiple catalytic converters may be replaced by a single unit.
C. The inlet of the single replacement converter may be located no further downstream than 18” (457.2 mm) along the piping flow path from the original exit of the final OE converter.
D. The extents of an OE converter are defined by the expansion chamber in which the catalyst is contained, regardless of placement within larger exhaust sections.
E. Replacement converters must have a minimum catalyst density of 100 cells per inch and minimum substrate length of 3” (76.2 mm).
Note: The SCCA does not encourage or condone the breaking of laws governing pollution control systems or the alteration of street-driven vehicles contrary to state and Federal laws regarding their use. It continues to be the responsibility of the individual to comply with such state and federal laws.
1. Any part of the exhaust system beyond (downstream from) the last catalytic converter, if so equipped, may be substituted or removed provided the system exits the car in the original location and meets safety requirements.
2. Vehicles equipped with exhausts that exit in multiple locations may change to a single outlet in any of the original locations.
3. Stainless steel heat exchangers are permitted only if the physical dimensions and configuration remain unchanged.
4. Modifications of any type, including additions to or removal of, the catalytic converters, thermal reactors, or any other pollution control devices in the exhaust system are not allowed and the system must be operable.
5. Replacement catalytic converters must be OE if the vehicle has not exceeded the warranty period as mandated by the EPA. Converters must be of the same type and size and used in the same location as the original equipment converter(s). This does not allow for a high-performance unit. If the vehicle has exceeded the warranty period, replacement catalytic converters must be OE-type.
6. Exhaust hangers which are welded on the car are considered part of the body and may not be changed or removed.