do i have to chip the ecu before i install my dsm 450cc injectors ...i'm currently runining a walbro 255, vortech FMU, B&M FPR..... my setup ist a TDO5 on a 95 LS.....i'm planning to get uberdata....later..please let me know

 

gotta have a way to control the injectors. It will use the same number of pulses and widths as 240's, which will give you way too much fuel.

So yes you have to get something to control them.