I am buying a used B1 from a guy to put on my 05....it doesnt come with a down pipe....do I need one or will my stock 4" work...Thanks..

 

yes unless that turbo has been modified to use the stock downpipe. (which I doubt.)

 

No you dont need to buy a downpipe as long as the B-1 is for a 3rd gen truck.
I have used my stock elbow and downpipe since my truck was new with a range of different chargers (including B1, SPS66, Aurora 5000)for my 3rd gen.

Faulkner,
Your thinking 2nd gen.

 

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