Kansas City

victorofhavoc

cost...

aluminum takes extra care to weld, more expensive equipment, more expensive labor (i know aluminum welders who make $80+/hr), and needs to be relatively pure to resist/hold heat, cracking, and daily abuse. You're looking at easily $5k for a typical low end aluminum exhaust.


performance...

One interesting property of steel for exhausts is that it holds heat to a certain temperature so that you don't get a lot of thermal loss. The property of holding heat versus dispelling it allows gasses to be propelled out of the pipes rather than having to reheat the walls and lose energy like in aluminum

__________________
Had a 2010 WRX- boy was it quick in a straight line, got a 2014 Z- man is she grippy in the corners-- then left the Z and later got a GTI, now back in an 09 racecar Z!