Big gun exhaust?

i found a good deal on an Big Gun exhaust system for my 08 YZ450F, dont know much about the the exhaust, its the EVO R. i was looking to get the fmf 4.1 w/ mega bomb but this deal came up, so if its possible to answer is their a big comparison between these two exhausts as far as performance gain on my bike? and do you have any pics of the big gun evo r system on a bike.


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