Super Jet full 61x vs 61x/62t low-mid range power

[ArsenalR]

Do you think an actual 701 stock exhaust tube will improve low end on a stock 61x? They look about identical if you put them side by side, a 650 vs 701 tube I can only see that the 701 tube is thicker? Anyone?

 

[newbee]

I think the 701 is a little bigger. But I would go after other parts of the setup that would help more first.