mine are room temp pretty much (non-vario). but i have used the bits mod kits for
the pumps and they tend to "heat" a lil. more like a heat-exchangers.
like BNEG said, if setup and bled there isn't really a noise to be heard. making a
sweat-box would not be good...
currently, im using the OE nuts (yuchh) unti i fund more phoo-phoo for dress-up.
but, thats what i do, make it work, function and then gussie it up with bling.
airdeano