would it be bad if I put high flow fuel injectors in without running a turbo or S/C. And if its ok what size should I get?

 

Don't do it.

Without a tune you'll lose fuel economy AND lose power. Not worth it at all if you don't need extra fuel.

 

i might be totally wrong . but you could change the work load on the injectors so if you really wanted more gas you could tune the stock ones to do a bigger work cycle but it will drop the efficincey of the injectors . the more work you make them do the better chance of failure . there is a happy medium for them . depends on how much fuel you need