Super Jet '90 Superjet - Worth Updgrading Exhaust Tube?

[Midlake Crisis]

My '90 Superjet needs structural repairs, and while it is stripped I am wondering if it is worth the extra effort to replace the smaller exhaust tube with the larger size used in the 701 skis.
I will be running a ported 701, B-Pipe, TDR waterbox.

 

[Quinc]

I doubt you would notice a difference. But if you already have it apart, why not.

 

[Big Kahuna]

Yes it will help. Will it be a huge difference? Not really, but just another piece of the puzzle.

 

[BruceSki]

If you are just running a 701 and not trying for every last bit you don't need it.

If the tray is cut open I would say do it. I have done it on every square I've ever owned. There is a reason Yamaha made that tube bigger when they went to a dual carb motor that used more air and fuel.