I can get 409 for cheaper so I was wondering if it is okay to use 409 stainless without any problems later down the line? Car is not a daily driver btw...

 

Google search first result:

"409 is a titanium stabilised ferritic stainless steel. Although regarded as a general-purpose chromium stainless steel the primary application for Grade 409 is automotive exhaust systems. Its applications are those where appearance is a secondary consideration to mechanical properties and corrosion resistance and where some weldability is required."

You're good to go

Read through this before you purchase though.

http://www.azom.com/details.asp?ArticleID=969

It will be strong, but will not be very pretty as it will form a light surface rust over time.

 

LOL, I read that before I posted this but I thought I would check my my HT friends first hehe - Thanks for the heads up - I will be using 409!

 

I used 409 on the exhaust for my truck one winter and its got a brown redish laywer over it. Sand it and it polishes out. Hard to cut i find.

 

i used the same stuff and managed to weld it pretty nicely with flux core for mild steel. lol