Hey guys im a little confused. I have a 96 3500 with five speed. I have put a cold air and bigger exuast and boost controller on my truck and it runs very well. This is the confusing part. I did the same thing to a 94 3500 with automatic plus a new IP and marine injectors and runs alot weaker. This 94 is a dog compaired to my 96. Any ideas would help thanks.

 

Might have to do with the ECM programming from OBDI to OBDII