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2016 Dodge Challenger
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The factory exhaust tube is mild steel with a thin layer of alum on the outside to keep it from corroding. (Works for a while) (they rust out from the inside too tho). If your gonna weld in muffs yeah drop it to weld 360° and spray it with some high temp paint after. If you only want corrosion from the inside (there is no cure for that with steel tube) you will need to drop you system every couple years and repaint it. Or build a stainless system and forget about it. Your mid pipes are already 409ss it’s just everything behind them that is steel
 
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