Low carbon or Aluminized

67redcudavert said
Stainless is best and will last a long time, but a lot more money. Aluminized will last pretty good and is not hard to weld. Low carbon should be last choice, rusts easily and won't last long.

Stainless is also the last time you'll ever spend money on an exhaust. If it's something you are going to keep. Think about it long term financially.