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Why bother with a muffler (the flowmaster) if you're running a cutout? Isn't a cutout pretty much straight pipes? If so skip 'em both and just run it straight

Or maybe some electric cutouts + a quieting (stock one maybe?) muffler. So you can be quiet and sneaky when you want, and obnoxiously loud at all other times

Are you wanting the muffler to have the dual exhaust appearance?

 

I would do that but I live in CA and have to pass all the emissions crap. So I have to have my cat and stuff. It sucks

 

i would run the catback with no cutout I mean it did not come from the aftermarket factory so there is no reason to modify. need little back pressure. and a high flow cat will be worth a lot of power.