Looking at my sig how much of a diff. will it be between a stock bore high comp piston vs a 416 kit, i am debating between these 2, i will also be adding a stg2 hotcam also! I would like to stick to stock bore right now so i can put the extra 50.00 into some more work on my porting? Is there a big noticable diff. or should i get soem decent power from stock bore hc piston??