Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

i have an X16XE sport and was wondering if a larger throttle body from say an x18 or x20 would fit?

or if their would be any gains?
im sure it would help abit if it was fitted as im trying to get the most out of my engine without spending too much

thanks
Dan