I've shared a 3D model for Borla Induction Throttle Bodies (previously TWM Induction) Series 2000 over at Printables! https://www.printables.com/model/453597-velocity-stack-for-borla-induction-throttle-bodies
These are 45mm diameter, and 60mm tall stacks. I recommend printing these in a heat resistant material, such as Prusament PC Blend Carbon Fiber, or Nylon. Pictured in my 1999 MX-5 where they were used for over 2 years!
