DCOE / PHH Velocity Stacks
thingiverse
Here are a variety of velocity stacks I designed specifically to fit OEM Toyota Mikuni Solex carburetors - most of them with a 49mm outlet to match the inlet of the Toyota version of the carbs with the reducer chokes removed. There are also a few 44mm stacks as well. Choose your length wisely - you want 19mm of internal clearance between the lip of the velocity stack and the inside of your plenum or air filter element. Don't run sock filters - they stifle all your power. I'd suggest printing in PETG or Nylon. Modern OEM intake manifolds are made of glass filled nylon. PETG has similar resistance to fuel and good enough resistance to heat to print stacks like this.
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