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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Long tubes wont work, there would be too much heat on the tranny and transfer case. The stock y pipe dosent look like much of a problem to me. Its no different than a aftermarket setup. I coukld be wrong though. But I am happy with what I got it works for me.
The stock y pipe is very congested when it goes into the Y at the cat...like they just CRUNCHED the two tubes together to get it to the diameter of the cat. That is where the big restriction is.
YOu can get an exhaust shop to grind out that part of the Y pipe (or do it yourself) and then just have it welded back to the Cat.
And many people here have longtube headers on 4x4s.