i have...

-440cc injectors
-3'' full cat-exhaust
-stage 4 competition clutch
-255 fuel pump
-p28 on crome

can i use this setup for a stock engine with only i/h/e

since i already have these parts i prefer to use them again!

 

Everything except for the clutch kit and crome would be overkill and a waste. If you plan on building the motor, the injectors would be fine with tuning.

 

you should be good after a tune! no tune and its gonna run like crap and you might mess the motor up!

 

what kind of compression do you plan on running?

 

stock gsr engine.

 

you can run that...just get a different tune

 

yea the injectors are overkill without a tune
the exhaust is fine, will be loud, i have a friend with full 3" on his d15, its freaking loud!
the clutch, thats mainly gonna be an issue with driveability for you, but i have a clutchmasters stage 3 and its not that much different pedal wise that a stock clutch
the fuel pump is fine, it just will be circulating fuel more,
crome tuned ecu is fine too, just needs to be retuned.

 

You should be ok. The exhaust is a bit too big for a stock motor, but you can make it work. The injectors are a bit too big but should be fine with a tune. And the clutch is perfectly fine, i have the same one and its perfect for the street no matter on what motor.
Change the exhaust to a 2.36 or 2.5 and get smaller injectors and it should run like a beauty with a good tune.