Hey, I love my FMU
Just make sure it is on correctly......
Entry level and keep boost modest, stock ignition is fine. - Yes
Stock injectors are 19lb, right? - Yes
Will I have driveability problems if I stick with them? - Not as long as you have the FMU set correctly.
As far as used goes, what should I be wary of? - Beat to death, incomplete kits, people you dont know. Get new, you be happier.
For Comparision, guy came to the track this year with a STOCK 5.0 MTX and a NOVI 1000. All, and I mean all, he had done was a track heat intake and the NOVI. He was trapping 107MPH. That is a 12 MPH increase over stock (95)