SS Exhaust Manifold for S2000

I'm looking for a high-performance exhaust manifold specifically designed for an LS engine in a Honda S2000. The primary goal is a custom performance exhaust. I have 3d scans and tons of pictures. Ideally would like to 3D print a version to test before making out of steel.

Ideal Skills and Experience:
- Expertise in automotive exhaust systems
- Experience with LS engine swaps
- 3d-printing
- 3d modeling

I know primary size and length makes a difference in performance, Ive never made an exhaust from scratch and this is a tight fit. my goal is a high horsepower naturally aspirated built so the current log style headers I feel just wont benefit me. The steering shaft is my biggest issue. Unlike most LS swaps into the S2000, I kept the steering rack in place and moved the fire wall back to fit the engine behind the shock towers like the stock f20 engine was. id like for the exhaust to drop down and out the back like traditional style headers. Thanks for your time