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I did all that to a K12RS pipe a few yrs ago.
Cat chamber was 2 layers thick also, with a layer of perf metal and steel mesh (think steel wool) between the layers.
Once inside the chamber I found 2 separate cats for cyls 1/2 and 3/4.
There was not perceptible gain in performance, exhaust note is very slightly more 'throaty'.
My main goal, other than just to 'know how', was to get rid of all the heat that the cat held in the chamber directly below my gearbox, I HATED hearing that thing creak and pop with heat, and having the muffler canister boil spit 15 minutes after the bike was shut down.
MUCH COOLER now.
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Mike Kelly
Triple M Engineering
Triumph 900 Thruxton
KDX200
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