Well I have been reading up alot on the ECM's and stuff for pre obd2 and obd2 the easier way is to go away from obd2 and you can burn custom chips till you hearts content. But if you stick with the obd2 you will need a gm reprogrammer and they are pretty expensive. But you can modify the ecm without having to burn chips etc. Unless you can find someone who has access to one.964pt3 said:Has anyone here have a custom tuned OBD2 vs. a Module or Powerprogrammer. I'm thinking of a custom tune instead of the module I have in place for various reasons.