muffler help

I had the two muffler setup on ecsb. I had a dynomax bullet before corsa sport to tone it done due to raspiness with longtubes. then still had the dynomax bullet with a tbss muffler as well. tbh the tbss muffler and corsa sounded the same. Guess you pay for the name. On my 2006 CCSB, I have longtubes and all 3" piping with e-cutout and 36" magnaflow. Muffler is big. Before that I had same setup but with a 22" magnaflow.
 
I have 22" magnaflow with my long tubes. It's quiet until you give it throttle. Then it opens ups think it is the perfect loudness. But I have the whole cab sound deadened also...so that might be helping a bit.


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They're referring to case length (or length of the body excluding the inlets/outlets). Example: When someone says 22" Magnaflow they're referring to a muffler with a body of 5Hx11Wx22L. In this example the case length is 22" while the overall length (which includes inlets/outlets) is something like 28".

Also, when it comes to pipe ID vs OD, ID is the inside diameter and OD is the outside diameter. Example: a 3" ID muffler will slide over a 3" pipe while a 3" OD will only butt up to 3" pipe.
 
so for the sake of me being a bit slow if i buy a off the shelf magnaflow from summit this evening go home and cut my flow off will i be able to slide the flow right on over the stock piping and clamp it down and weld it back up and weld my turn down on the end of that??? looking at a 24" magnaflow muffler center in center out 3" in and out.