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BoxerRumble I found out how to get boxer rumble without having the to change anything in the exhaust. 130,000 miles on my car and I now just discovered this.. It's an actualized, good subaru boxer sound.
I just installed the "positive traction kit" and "positive shift kit" (whiteline and perrin upgrades) on my car and it tightens up the mounts including ones that attach or resonate with the exhaust. Result? The car's chassis acts like a speaker and you'll hear a natural rumble when you are riding beside other cars, passing under bridges, etc. Now the car is quiet when you need it, loud when you want it, and it has a lot of extra pep in the drivetrain to match the sound.