I have the 6.1 with the standard procharger kit and tune @6lbs. I also have an aftermarket exhaust on the car. I plan on doing some mods soon but I am not sure where to start. I eventually would like to stroke/forge the internals. I am trying to build the car in stages though since I cannot do all at once. Here is my question would it be better to forge the internals and use the stock top end or start at the top end and work towards the internals. I hate to forge the engine if I would not be able to get power to them due to flow restrictions on stock heads/cam? I would like some opinions where the best/cheapest HP gains are with my current set up?