Actually the cheap stuff is mild steel, aluminized is better and "good stuff" is stainless steel. As opposed to bending it yourself and getting pinch bends, just buy a universal ready to install exhaust system from Summit, like $200 and they are all prebent, and preflared to install with a slip/weld or slip/clamp.
Here ya go, complete header back with mufflers in 2.5" for $175!!
http://store.summitracing.com/partde...5&autoview=sku
Crud, here is a 2.25" for $150 with mufflers!!
http://store.summitracing.com/partde...5&autoview=sku
Step it up to $270 and you get the whole shooting match, headers, pipes, mufflers, clamps, etc, etc, etc!! Gotta LOVE SUMMIT!! (no I don't work there, I just love helping guys save $$$ and more importantly, FRUSTRATION!!
http://store.summitracing.com/partde...5&autoview=sku