I know this has been discussed here before, but the search function will not allow for anything less than two characters (Y).

Im going to start constructing the exhaust on my 5.3 S13 soon and its going to need a 2.5" Y merge to transition the two B pipes into the 4" rear section. I know the 2.5" to 4" seems odd but the rear section is in preparation for future forced induction.

Can anyone provide any examples of proper Y merge construction, or maybe even work one up for me? It does not need to be anything special seeing that in time it will be scrapped for the turbo manifolds and a single downpipe.

 

weld two pips into a V, cut off the bottom, and weld another pipe onto that. done

 

or you can get 2, 90 degree bends or 45 degree bends or whatever depending on your angle needed and cut one of the straight sections in half for both tubes and weld them together.

 

From Burns:

 

I found the same image last night. Cant think of a better example to use as a model.