Used 4×4, need help identifying parts

Hello,

Just bought a used wheeler. Found there to be an FMF exhaust/muffler installed.
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I cannot find anywhere online that sells and FNF muffler for a Honda TRX420…Not even on the FMF website. I dont know if someone just modified the flange and attached this, but it does sound decent. Not too loud/crackily.

Also had some questions as to what you guys see in these pics. I had them install a winch and I think that is what is in the back compartment now….
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And also, the previous owner installed a K&N air intake
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Just wanted to make sure from the pic below there isnt any kind of modulator/power commander??
http://i.imgur.com/ZoO4FSGh.jpg

From everything I have been reading, it seems like the quick mods are Exhaust, Air Intake, and commander. Just wanting to find out, since it has the first two additions….

Thanks!