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Suites like EFIlive and HPTuners allow the ability to tune just about every parameter on the car... handhelds are very limited in what they can do.
If you want something to read codes and make minor changes you get a handheld. If you actually want the ability to really tune the car you go with a software suite. The handhelds are a lot cheaper.. by far than the suites are....
EFI and HP have their owns boards ( forums) with plenty of help in there from real tuners ..
SO really it all comes down to how involved you want to be in tuning your car.
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