Yes, spend a wod of money and get the gutted and enlarge the insides. Or toss them and get a set of pipes from the head back. The header is very restrictive. I think the next cheapest system for the beast is the Jardines system 3-2. They are a bit throatier. In fact I think they sound great. If your also looking for power they are better then the TORS. But real power will come from larger headers and 3-1 design.