I have a HKS intake and will be getting a Racing Beat exhaust for my 89 N/A soon. What I want to know is: If I put in secondary injectors from a TII, will I also need to upgrade the fuel pump and will it mess with my ECU? Thanks for your help!

 

if you put larger secondaries your gonna want to use an apexi s-afc to lower the injector duty cycle so it won't run so rich. you won't need bigger injectos if you just get exhaust. you don't need anymore fuel pump etc. just slap it on and go. be prepared for how LOUD its gonna be

 

The stock injectors are good for around 250hp, and you won't be getting near that without a bridgeport, so don't worry about them.