when you had your ecu sent out to be socketed, is the guy burning you a basemap? if your riding on a basemap you wont be able to change injectors. your basemap has to be created according to the injectors you have. ie: if you have your basemap was burned with 240cc injectors in mind, and you swap in 450's you'll be running PIGGGG rich all day long. or vice versa, if he made the basemap thinking you'd swap in 450's and your still on your 240's i'd be sad to say it'd probably be the end of your engine if you hit boost.
i recommend dsm 450's because they are so cheap. but if you can afford it go with new rc injectors. new is always better than used.
post up pics of your peltier fuel filter cooling diy when its done