You spend 99% of your driving time under 4500 rpm so the flow isn't an issue. Plus, you're not dragging extra weight around from the larger pipe. 2.5 mandrel is good for an NA LSX all day long. I had 2.5 to the bumper on my LS1 Nova and still trapped 118 mph with just a cam.
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1929 Roadster Pickup
1961 Chevy Parkwood Wagon
1956 Chevy 210
Smithcraft Collision and Restoration
Newcastle , CA
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