I have a 2005 Honda Civic coupe, with FBO and have already bought 440cc injectors. I was wondering before I install the injectors would it be enough gain to be worth the money spent on the injectors without a tune because where im located tuning options are slim.

Any suggestions or help would be greatly appreciated, this is the first car that I'm building in some form.

 

The 440cc fuel injectors will not do anything for you to make power, so if you do not have a tuning solution, there is no viable reason to install them. Your 1.7L engine with I/H/E can be run safely with the stock injectors. You do not "need" larger fuel injectors until you are creating enough power to reach 100% duty cycle... well, actually more like 85% duty cycle is a much safer target, but you get the idea.