[raverbashing]

I know that, I'm more wondering what was the amount that immigrated to the US (in relation to Catholic Irish)

[azernik]

Many (including at least two Presidents). They just tended not to identify themselves as plain "Irish".

https://en.wikipedia.org/wiki/Scotch-Irish_American

[zumtar]

I don't have exact numbers to hand but I am sure the numbers of Protestant Irish emigrants was very high.

Poverty throughout the counties was common and they wanted to find a new and better life just as much as their Roman Catholic neighbours did.