WE KNOW HOW A GOOD SET OF HEADERS [large steped tube headers]MAKE REAL GOOD POWER W/AN OPEN EXHAUST RIGHT? OK THEN THERES YOUR ANSWER. LARGE TUBE HEADERS 1.750"-1.875" -2.00"(stepped preferebly)to 3"STEPPED TO 3.500 INTO THE FLOWMASTERS THEN SPLIT 2-3.00"-3.500" OUT OF THE FLOWMASTER! NOW YOU HAVE ONE BIG STEPPED TUBE EXHAUST AND THAT WILL SUPPORT UP TO 427CI OR A BLOWN SOMTHING OR OTHER AND YOU DONT HAVE TO BUY A NEW EXHAUST FOR YOU NEXT BEAST. AND IT SOUNDS SCARRY AS HELL.AND YOUR FARFEGNUGGEN IS @10+