heat exchanger

[aussie]

I want to enlarge my heat exchanger it was suggested to me from spares if i remeber correctly ---now do i buy a lager one or run another small one with the one i got--the reason why i want to incerease the size of it cause my engine will produce more power so more heat will come with it--Im removing the water pump and fitting a electric one that flows 115gph there is a 80gpm but i think its too small---had a look on ebay au seems theres not much in heat exchangers