They have a set of pipes that look closer to fitting but they're 2" diameter tubes and only 18 gauge steel.

32" x 2" primaries and equal length tubes - 3.5"x10" collector
http://www.holley.com/data/products/pictur...ge2847-1HKR.jpg

30" x 1.75" primaries and unequal length tubes - 3"x8" collector
http://www.holley.com/data/products/pictur...ge2461-1HKR.jpg