They are bosch motorsports injectors labeled as a scheid lightning. I run them in my truck and make well over 700hp with them. They are 143* spray angle which is the stock angle for 03-04 bowl design.
I have the scheid Lightning 100's and they were awsome I just recently sent them back to them and they opened them up to 150's and they balanced them also. If some one was looking for Inj. I would definatly point them to Scheid. As far as noise level there is none, My 04 runs a heck of a lot quieter than my 08 and the 08 is all stock except for the deletes and H&S.