This, like all of teh Unabomber's FAQs, is a great thread.
I have a question that isn't covered here, and that I've searched on but can't come up with a good answer. I thought I'd ask here and see what comes up.
When is EM really warranted? At what point is the stock ECU unable to adjust?
For example... I'm about ready to install an STi uppipe and Scoobysport downpipe (shorty) on my stock car. Does installing just an uppipe/downpipe warrant spending $800~ on having my car tuned.
Will I gain additional power, smoothness, AND safety by having my car tuned?