for my 2003 1.8t A4 I just upgraded with an APR tunning program where i can switch between stock mode and chipped. i am wondering what the best upgrade to go from there? i was thinking fuel injectors if so what are some recomended sizes or brands maybee bosch or stick with APR please let me know guys

 

I guessing you have APR 1?

I don't know if it is necesary for apr 1 to have fuel injectors. I know the Apr 1+ you do.