My car is chipped and I have a borla exhaust . I had a 2002 A4 previously and had larger injectors put in and they made a big difference. My question is will injectors make a difference on my s4 and would the best ones be the greentop 42lb (440cc) ford racing injectors?

 

yes... bigger injectors mean more fuel.. more fuel, more power...etc.. (as long as timing is there of course as well as right amounts of air mixture)