Brake servo replacement option

[Kevin-mini]

Hi all,

I've seen this brake servo on carbuildersolution's web site.
It's a "COMPACT DUAL CIRCUIT REMOTE SERVO"
http://www.carbuildersolutions.com/uk/c ... rake-servo

The Canister diameter is just 138mm and, overall length 380mm.
It's really compact but, I can not understand the spec/performance.
It claim "2:1 power boost ratio @ 600mm Hg vacuum".

How about the boost performance compare with my original 93' SPI mini's brake servo ?