I'd like to believe when you pound headers the steel just re-shapes and you don't loose total area. Kind of like how there is nothing made or lost in nature, just recycled.
I see what you're saying, and ya you probably do lose a little area, but it will still equate to 0hp lost.. if anything I will sacrifice power cause they're 2" primary header on a head, cam, and intake 383 where a 1 3/4" primary would do just fine..
But I was on a tight budget, and $400 was the most I've ever spent on headers..
After I spent a week installing, and pulling my combo to fit the headers, the whole combo can be in and out in around 2 hours..
