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An upstream air injection point, ahead of the catalytic converter, is also sometimes present to provide additional oxygen only during the engine warm up period.
Considering cat-back exhausts replace more restrictions, they typically offer increased performance and noise compared to axle-back systems; however, they’re also more complicated to install…and more expensive.
A stock system is designed to reduce and if possible eliminate all the noise produced by your vehicle. Because of this, the axle-back exhaust system does not impact the flow or pressure of the exhaust gases in any way.
Most designs of the time therefore included secondary air injection, which injected air into the exhaust stream. This increased the available oxygen, allowing the catalyst to function as intended.
Typically, that includes a mid-pipe, muffler, tailpipe and tips.