140 DZ new header. . . what pipe?

[Lees,John W]

Hello:

I have a 140 DZ that I used for 1 season w/old style (until 1 mo ago) wrap
header and brace. NMP I think. With that I used an (old) AAP 120 pipe and
had OK results. I purchased one of the new "high flow" headers and am
putting it in a new plane with the DZ.
 My ask is: What is the best 4 cycle pipe to use w/ new header?

 Which one has the best size and performance match to the new header design?

Thanks to all who reply in advance -- john lees 
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