I was wondering if the RV6 PCD change the exhaust note on the TL?

 

first you have to understand what it does and what a catalytic converter is.

once you understand what you are changing, you can understand how it changes the tone.

Many vehicles have a close-coupled catalytic converter located near the engine's http://en.wikipedia.org/wiki/Exhaust_manifold. This unit heats up quickly due to its proximity to the engine, and reduces cold-engine emissions by burning off hydrocarbons from the extra-rich mixture used to start a cold engine.
When catalytic converters were first introduced, most vehicles used http://en.wikipedia.org/wiki/Carburetor that provided a relatively rich http://en.wikipedia.org/wiki/Air%E2%80%93fuel_ratio. Oxygen (O2) levels in the exhaust stream were generally insufficient for the catalytic reaction to occur efficiently, so most installations included http://en.wikipedia.org/wiki/Secondary_air_injection which injected air into the exhaust stream to increase the available oxygen and allow the catalyst to function.
Some three-way catalytic converter systems have air injection systems with the air injected between the first (NOx reduction) and second (HC and CO oxidation) stages of the converter. As in the two-way converters, this injected air provides oxygen for the oxidation reactions. An upstream air injection point, ahead of the catalytic converter, is also sometimes present to provide oxygen during engine warmup, which causes unburned fuel to ignite in the exhaust tract before reaching the catalytic converter. This reduces the engine runtime needed for the catalytic converter to reach its "light-off" or http://en.wikipedia.org/wiki/Operating_temperature.
Many newer[http://en.wikipedia.org/wiki/Wikipedia:Vagueness] vehicles do not have air injection systems. Instead, they provide a constantly varying air-fuel mixture that quickly and continually cycles between lean and rich exhaust. http://en.wikipedia.org/wiki/Oxygen_sensor are used to monitor the exhaust oxygen content before and after the catalytic converter and this information is used by the http://en.wikipedia.org/wiki/Electronic_control_unit to adjust the fuel injection so as to prevent the first (NOx reduction) catalyst from becoming oxygen-loaded while ensuring the second (HC and CO oxidization) catalyst is sufficiently oxygen-saturated.


in short, you are changing out an exhaust piece. YES it will be louder....

 

Sooooo his question is... Will changing part of the exhaust changes the exhaust note?.... Omg!... Just so im clear.. u have a stock exhaust system and you want to change it and delete a catalytic converter and u want to know if that will change the sound of the previous system that had extra stuff in there?.... #mindblown!