i have after market injectors on my 12v that came with the truck when i bought it used. I had them rebuild and tested to see how they spray and they over filled the bottle they use to test them iv done research on them i am sure there bigger than 40hp injectors and i still have stock delivery valves should i change the stock with bosch after market ones sorry for a long post

 

If it were me I would keep the stock 181's you have now

 

i had 191 comp laser cuts from ddp and .093 lines and it had a tiny lope sounded cool and was not even a inconvenience what so ever with my 140horse injectors you could tell a difference on the top end and mid range for sure!!

 

alrigfht sounds like ill just keep stock for now