Exhaust Manifold
Info provided by Calvin of Nivlac57 Youtube Channel
The Vortec 4200 cam with 3 different exhaust manifold configurations.
The manifolds looked very similar from 02-07, but they had a major change in 06 to the port shape to match the improved cylinder head. 06-07(left), 02-05(right).
The 08-09 manifold features a 3 into 1, and then 2 into 1 design.
For the Naturally aspirated guys, there are long tube header options out there. The manifolds can be easily modified much like the LS manifolds to accept turbos. Just weld it. It's cast steel, not cast iron.
If you are not a fan of welding the cast manifold, you can also make a tubular manifold like the one on my Studebaker. You can buy flanges here: https://www.racemufflers.com/Chevy-4-2L-Inline-6-DOHC-Stainless-Header-Flange-p/rm2652hf.htm
ARTEC Performance
Artec Performance also offers a beautiful offering for a T4 turbo manifold. These things are sweet!
