Mazdatrix sells an aluminum version.
$150
http://www.mazdatrix.com/b8.htm
http://www.mazdatrix.com/getprice.as...m=15-1720-ALUM
They are not interchangable between Zenki and Kouki FC's.
The bolt patterns are different - 2-bolt versus 3-bolt.
BTW, turbo versus non-turbo are the same part numbers for the same series.
-Ted