[Keller]

The up pipe is unpolished stainless.

A lot of TR vendors sell MAF pipes. Just a few others:
http://www.buickgn.com/mafpipes.htm
http://rjcracing.com/product/maf-up-...inch-maf-pipe/
http://www.fullthrottlespeed.com/ite...atus+0+Tp++Bc+

And others. They tend to be aluminum.