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The spacing is the same but what you do is drill out one tapped hole and use a bolt and nut on it. Here is the rub. The TT 50 muffler isn't as long as the KSJ 30 Competition muffler but the TT 50 muffler fits better as you only have to drill out one hole to make it work. The KSJ will foul the throttle arm so you have to be careful to work that out, the KSJ doesn't fit too well in the FT canopy and in my case I had to machine a tapered spacer to angle the muffler away from the Caliber tank and still clear the throttle arm. The KSJ has more volume than the TT by probably 7-10%, maybe. Volume is what makes the 37 cook.
isn't the spacing on the .37's muffler mounting holes the same as on the .32 at 35mm? How are you getting the 50's muffler to fit @37mm
We have a Toki muffler coming here to test and make sure it will fit properly without a spacer and still go under the FT Canopy. Like I said, the 37 thrives on volume to help extract the exhaust gases. In my case the KSJ added 100 rpm to the head speed and makes the Caliber sound like a 50 or 60 size machine. The little machine really has some nads with the KSJ muffler.