Exhaust Systems

/Exhaust Systems
Exhaust Systems 2023-10-23T21:05:49+00:00

Proudly serving Evans, CO, and surrounding communities

The exhaust system carries exhaust gases, treated by the catalytic converter, through a resonator, if applicable, and into the exhaust muffler where exhaust noise is lessened. In order to secure the exhaust pipe to the exhaust manifold, a flange and seal-joint coupling is utilized. The exhaust system may utilize a slip-joint coupling design with a clamp and a U-bolt or a flange connection with a gasket. Exhaust hangers and rubber insulators help to support the weight of the exhaust pipe along with insulating any exhaust system vibration, rattle, or noise. Exhaust hangers also space the exhaust system away from the under-body of the vehicle and allow the exhaust system to expand as the exhaust system warms up. Exhaust heat shields are used to protect the body and other components from damage due to the heat from the exhaust system.

First Class Truck And Auto Service can repair your exhaust system or if needed, completely replace the entire exhaust system on your vehicle.

The catalytic converter is an emission control device added to the engine exhaust system in order to reduce hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) pollutants from the exhaust gas. The catalytic converter is comprised of a ceramic monolith substrate, supported in insulation and housed within a sheet metal shell. The substrate may be wash-coated with 3 noble metals:

  • Platinum (Pt)
  • Palladium (Pd)
  • Rhodium (Rh)

Since the catalyst in the converter is not serviceable, we can replace your catalytic converter with a Direct Fit catalytic converter(S). We only install Direct Fit Catalysts that is Emission Compliance, which meets or exceeds Fed or CARB standards.

Important: Use of non-OEM parts may cause driveability concerns.



  • Brakes & Brake Repair
  • Oil Changes
  • Tires & Tire Repair
  • Mufflers & Exhaust
  • Check Engine Light
  • Belts & Hoses
  • And Much More...
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First Class Truck And Auto Service
3725 W Service Rd
Evans, CO 80620
(970) 330-9038