Roush+MAC exhaust

I have roush exhaust and I love the soubnd. The reason roush don't have headers extra is during testing of rouscharger headers decreased power

icepirate, there really is no power difference between axel backs and cat backs( which are just axle backs with over axle pipes). ford factory over axle pipes are already mandrel bent and flow fine. as for getting the roush parts to mate up to the mac parts you shoudl be fine, becuase the mac(assuming your getting their long tubes and prochamber?) should mate up to the rest of the factory system. the mac cat back kit just changes a few of teh bends over the axle for a little straighter pipe, but same performance as stock.