Is there room in the tender to install a Tsunami Sound decoder in a Jupiter engine?

You folks are the best.  I never realized they went that slow and waddled.  It does have gobs of power and can easily out pull the 4-6-0 on the same grade. 
Watching the videos on You Tube was a real education.  Didn't realize there were that many other folks who shared my love for a picturesque little engine.
THANKS.  No need to contact Bachmann now.....     Al

I have an new 80 ton Shay and a new 4-4-0 both by Bachmann.  The Shay runs about half the speed of the 4-4-0, certainly not fast enough to win the Formula 1 race!  The Shay pulls five or six cars up a 2 to 3 % grade without any problem but is very slow.  Also the sound acts like its going 200mph but it is barley crawling.  Another thing it seems to 'waddle' along - that is shift from side to side.  None of the cars do this nor does the 4-4-0.
  Is this normal?  Any ideas?  Or am I a worrying new owner!   I am using an NCE DCC system. 
  I love my Shay just wondered if it should be going faster.