Here's what you need to consider:
* Year of the vehicle: Emission regulations changed significantly over the years. Older 305s might have had different exhaust manifold designs and catalytic converter requirements compared to later models. This drastically impacts what's feasible and legal.
* Headers vs. Manifolds: Headers offer better flow and often accompany performance exhaust systems. Manifolds are usually stock equipment. Using headers usually requires custom fabrication or purchasing an aftermarket exhaust system designed for headers.
* Exhaust pipe diameter: The diameter of the exhaust pipes will affect the back pressure and performance. Larger diameter pipes generally flow better but might require tuning.
* Catalytic converter type and location: You'll need catalytic converters that are compatible with your vehicle's year and emission regulations. They're usually located after the exhaust manifolds/headers, before the mufflers. Some systems might have a single converter per side, or a dual-converter design.
* Muffler type and location: Muffler selection impacts sound and performance. You have a range of options from quiet to loud, and placement can influence sound and system layout.
In short: It's *possible* to fit a dual exhaust with dual catalytic converters to a 305 Chevy, but it's not a simple "yes" or "no" answer. You'll need to research exhaust systems specifically for your vehicle's year and model to ensure compatibility and legal compliance. Consult a local exhaust shop for custom fabrication or to purchase a pre-made kit appropriate for your application.
