Question to everyone, currently I have a 2009 GSX R600 and wanted to replace the stock exhaust. Was looking on grabbing http://www.motosport.com/CA/motorcycle/2009-suzuki-gsx-r-600--M4-GP-Series-SlipOn-Exhaust-Black.
I've been reading a lot of forums, including this one and I get 50% says you need a Power Commander and the other 50% says you don't need one if you don't cut the Cat.
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