Why Mild Steel for Exhaust Systems? Mild steel tubing was once a top choice for exhaust components due to its affordability, lightweight design, and ease of use. Its malleability made it a favorite for custom exhaust projects and repairs. However, mild steel has limitations: it rusts quickly and has a shorter lifespan compared to more advanced materials like stainless steel or aluminized steel. While it’s budget-friendly and easy to work with, modern alternatives now offer better durability and corrosion resistance. Consider the trade-offs when selecting mild steel for your exhaust system and explore longer-lasting options for greater performance and value!