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EXHAUST  DESIGN
Generically speaking, there are 3 exhaust designs:
1.  chambered

2.  2 pass, twin loop, or sound-cancellation design

twinloop muffler

3. straight-through

The straight-through design is when you look through the tip opening, you can see straight through to the other side of the muffler…no bends, or staggered pipes, or chambers.
The majority of popular 60mm diameter [...]