Shop for Aftermarket Exhaust Parts for the Kenworth T300 and T450. Durable, quality-made exhaust parts can sustain the resale value of your rig while enhancing its unique appearance. Whether you are looking for exhaust elbows, piping, adapters, or a similar part, there are plenty of options to choose from. Exhaust parts are a great way to start customizing your Kenworth heavy-duty truck and upgrade your truck's exhaust system in general.