awww man i wouldn't pull it out yet. See what it can do first before changing it around. Wonder if one of those little rubber exhaust deflectors would help with high pitch sound. I know on my heli it made it a bit quieter.... maybe try for heck of it even though it sounds crazy....
MVVS i think makes a mini tuned quiet pipe. may give that a look. or a full length muffled pipe set up maybe.....
If that don't work pass out ear plugs and make it a happy ending...
everyone happy!