Howdy,
I remember reading some time ago, someone put a jet engineering, incowl muffler into one of these 1/4 scale caps. They mentioned they had to cut the cowl up a bit and they couldn't extend the outlet. If you have done this or had experience with these mufflers could you post your experiences, eg, how big a hole you had to cut in the cowl, if you can extend the outlet without killing the performance etc, and if so could you please provide pictures of this.

Thanks Gilly