| There are a couple guys making cast iron exhaust manifolds. Jon Abeler has a handful out to folks to try, myself being one of them. Mike Smith has some CAD drawings of his version, and to my knowledge one guy on this forum is using them. IMO, cast iron is the way to go for highly improved performance and longevity. Sure, equal-length tubular manifolds will flow a bit more but for twice--sometimes more--the price. Here is a link to a picture of the manifolds I received from Jon: La-Z-Link Sorry for hijacking this thread. I'll do better next time :)
Kris 1991 300ZX TT 1998 BMW M3 supercharged 2000 Dakota QC 5.9L 
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