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Soon ill have my 545 (p51 heads,10.8 comp,hyd roller cam,950 carb), which makes 635hp at 5800 and 640tq on pump fuel ready for some custom made headers. My question is what size should i use 2, 2 1/8 or 2 1/4 inch and which is better for the street 4 into 1 or tri ys. As im worried the car is pretty low so im thinking of using tri y. What do yous think.