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How much banking on the track?
But anyways, many race cars have custom made upper strut bars welded to the chasis. If you do weld it make sure it aint in the way of something like the engine. I wouldn't weld sway bars to the car at all. On your first post I was thinkin' you wanted to cuts/weld the car to make other things fit which is a no-no because its something structural usually.
Are using the car for race only or street use & race?