Compression Ignition Addict
Join Date: Feb 2013
Location: Merritt BC
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I'm planning a cab off this winter the same as you & have been looking at doing Exhaust manifolds & up pipes.
I believe the Rudys up pipes are stock material pipes that they rebuild with custom flexible bellows, where as the RCD up pipes are custom built from scratch from heavy wall 304 stainless steel.
There are a lot of choices out there for manifolds & up pipes,
I like the Steed speed manifolds but he is having some production difficulties & his manifolds for the 6.4 are all on back order. These also require custom built up pipes which are available thru Rudys or Elite. Very nice pieces but pricey.
RCD makes some really fine looking 304 stainless manifolds for the 6.4. These will accept stock up pipes or their previously mentioned 304 Stainless Up pipes. These go for about the same $$ as the Steed speed stuff.
There is a Stainless log style manifold for the 6.4 available thru Rudys, but I don't know who makes them or what up pipes fit. Rudy's also offers a ported & coated 6.4 manifold but I haven't seen many comments on these either.
I will have to take a look at the Dark horse stuff, thanks.