stainless steel vs aluminized steel, mandrel bent vs regular bent

if it were mine tti's 2 1/2 in. x pipe manifolds back system and then that's it.... i have had headders on a few of my cars and trucks and the 1 thing they all have is they rust out! no matter what you do they all will need to be replaced somewhere down the line again and again....at a min of 400.00 a set that gets old pretty quick. for me never again.....