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What is the pipe between catalytic converter and muffler?

vadedram

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Dec 17, 2020
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Hello,

I just got done installing the Flowmaster Outlaw catback system (817936) on my 2019 Rebel. So stock there are the cat that connect to a straight pipe that has a small bulge in it that then connects to the muffler. This Flowmaster system removes both that pipe with the small bulge and the muffler (and of course anything else all the way back).

I actually didnt remove that straight pipe with the small bulge in it because it would have required dealing with nuts and studs that would have broken and then stud removal. A pain I didnt want to go through. So with this Flowmaster kit they provide an extension pipe for crew cabs (mine is quad). I ended up just cutting between the small bulge and the muffler. Used the extension pipe, and everything worked out nicely.

My question is what is the pipe with the bulge. It literally looks just like the high flow cat I put on my VW GLI, but it isnt a cat. So what is it. Some other resonator?
 

MayhemMOORE

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It’s a resonator. Designed to reduce drone in the cab. I’m pretty sure the ‘21 I just got doesn’t have it, but the ‘20 I traded in did and I just left it there.
 

vadedram

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Not worth touching then. This system already gets rid of the back resonators and swaps in a muffler that looks like it barely does anything. haha.
 

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