I used a KS header with a 25 mm drop... no flex. I am pretty sure. Maybe it is 0 mm drop. I bought a slick canister hanger/mount from TBM as well. I will use a KS 86 canister. I trial fitted all this and it looks great. A regular front exit canister will not work in this 260 because of the gear mount..
http://troybuiltmodels.com/Mufflers.htm#plate