Depends on what you base stage tuning on. What you described I would say is more accurate for the cars as a whole ie motor trany suspension etc. With my saab I have found that it they do the stages just on engine performance and it goes well past stage 3. Maptun a Saab specialty company goes all the way to stage 7 :blink:. Pretty much it goes like this....
stage 1- cold air intake
stage 2- cai and aftermarket exhaust
stage 3- cai 3in exhaust and a ecu remap
stage 4- stage 3 with bigger injectors upgrade factory turbo componets
stage 5- bigger turbo etc...
as you can see the stage process just describe at what point in your build that you have reach since each stage builds upon the last. And by doing this reliability still stays pretty well intact. Just in case your curious my car is factory with 225 hp. Stage 3 should bring me in the neighborhood of 320 hp. Stage 7 brings you to 515hp more that double the factory setup and extremely hard to handle but fun!
