questions about 2007 subaru legacy 2.5i exhaust

They are welded to pipe that connects at a flange. The flange is near the back axles, thus the term "axle back". Then it goes mid pipe, then your cat section, then headers.

You can have a muffler shop cut off the stock ones and weld on new ones, or find another one and have it done up how you want and just bolt it on.

 
If you got an axle back specially for your car they should just bolt on and you'd keep the flanges.

 
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