oh no stupid question at all.
the DC and all other true duals have 2 pipes all the way unliek the stock setup that has the y pipe to merge the 2 outlets from each cylinder bank soooooo...
stock is 2 headers ,2 cats , y pipe then single mid pipe, back box
true dual is 2 headers , 2 cats and then 2 mid pipes , back box or hat ever its going to have to finsih the key being 2 mid pipes so if you get the ichiba y pipe youl ahve to get rid of it becuase the DC does not merge the mid pipes it stays as 2 the whole way.
best way is to take a look at the website nd youl see what i mean if you dont get it already...