crank up the stereo!

hehe i'll give the coppers some ear plugs when they pull me over...

i've mastered the accelerator to be honest, there is a point where the exhaust is completely silent...when in doubt i just drive like that lol

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MY04 WRX CLUBSPEC 7

well according to one exhaust shop, there isnt really any room underneath a rex to fit another muffler.

seems like my only option is change the rear cannon or change cat back system....

To reduce the noise of a loud muffler you can add another muffler in front. It should reduce drone and noise with no noticeable reduction in power and more effective than a resonator/hot dog. The bad news is, yes as you were told, there is not really space to put it in, it will badly reduce the ground clearance and you will scrape on speed bumps and slopes.
Best option is to replace the xforce canon shape with a quieter design and brand.