Someone school me on header size.

I found the article. Notes are added with each photo and the dyno chart for all is in the last pic.
Peak numbers are no where near as important as across the board numbers - "area under the curve".
TTI has the added benefits of better fit, thicker material, more ground clearance, easier installation and no need for the 90* oil filter adapter over most other headers.

While this shows a mild 360, mine is race only running as fast as 11.14 @ 117+ in a 3540+ lb car, auto trans & footbraking. I wouldn't use 1 7/8".

Exhaust on a Mopar 300hp Crate Engine - Tech Articles - Mopar Muscle Magazine