I have a tgb r 125x can't find full sport exhaust or down pipe,wondering if it is possible to weld a 51mm slip on silencer if I cut silencer off one piece exhaust and reuse down pipe which is only 23mm.
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Yes, design a cone with the two diameters to match the ones you state.
Then put a cut line to open it out flat and you have a template to use to cut the sheet metal so you can fold it.
In fact, a classic engineering design drawing exercise...
Depending on the space you have, then the minimum losses is with an included angle of about 6.5 degrees... But also consider using a flat plate could cause odd behavior in terms of pressure effects.
Solar Mike
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