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Shankenstein · 02-28-2013, 03:29 PM

I take back the statement. Check out this link: MATERIAL SPECS

They suggest that the surface coating will happen in normal air, and a light rust will protect against further corrosion. Seems like you should not remove the rust, but rather just deal with the finish.

I don't like that answer, but a few other sources say similar things.

Borla uses 304, I've seen some pricey systems use titanium. Cheap exhaust is aluminized steel. This is the first I've ever heard of 409, but apparently it's the go-to material for exhausts because it's inexpensive, relatively corrosion resistant, and weldable.

02-28-2013, 03:29 PM	#37
Shankenstein Frosty Carrot Join Date: Jan 2013 Drives: The Atomic Carrot Location: Baltimore, MD Posts: 513 Thanks: 272 Thanked 431 Times in 199 Posts Mentioned: 19 Post(s) Tagged: 0 Thread(s)	I take back the statement. Check out this link: MATERIAL SPECS They suggest that the surface coating will happen in normal air, and a light rust will protect against further corrosion. Seems like you should not remove the rust, but rather just deal with the finish. I don't like that answer, but a few other sources say similar things. Borla uses 304, I've seen some pricey systems use titanium. Cheap exhaust is aluminized steel. This is the first I've ever heard of 409, but apparently it's the go-to material for exhausts because it's inexpensive, relatively corrosion resistant, and weldable. __________________ If you think you're nerd enough, join in the discussions about Suspension and Aerodynamic modelling! Wall of Fame - JDL Auto Design, Raceseng, Vishnu Tuning, Penske Shocks, Nameless, Perrin, RaceComp Engineering, Essex/AP Racing, Verus, RacerX Wall of Shame - aFe Takeda, Wilwood, FA20Club