I’m in the process of building a custom expansion chamber for my DT100 DTX hybrid setup (DT bottom DT head RT100 jug RT reed). I already built Version 1, but before fabricating the final version, I want to make sure I’m working with proven specs.What I NeedIf anyone here has:

• A working expansion chamber design for a DT100, RT100, or similar 100cc Yamaha 2-stroke
• Dimensions (header length, diffuser stages, belly diameter/length, stinger ID length)
• Angle degrees for each diffuser stage
• Tuned length recommendations
• Even partial drawings or measurements

…I would be extremely grateful. I’m fabricating in Pakistan, so I have access to metalworkers—just need correct data.My GoalI want a chamber that delivers:

• Strong mid-range pull
• Stable daily usability
• No overheating
• A clean, crisp powerband that suits the RT jug’s smaller reed area

If anyone is willing to share their proven designs or even rough measurements, it would help tremendously.  
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