will the jet pcm, power control module, replace a tune or will it be in addition?

 

The module you refer to does nothing really. Dont spend money on anything but a CAI and a tune!

 

With all due respect... The Jet module is quite impressive I know for a fact it performs as well if not better than all of the other tunes out there.
Now with that said I defiantely agree with the CAI and you should use a PROGRAMMER instead of the module.
While the Jet module has one of the most impressive tunes on it, it is a weak link in that instead of writing a program in place of the stock tune in your computer, it piggybacks onto the stock tune and again while making impressive gains it is subject to pre-mature failure
This is why Jet now makes a PROGRAMMER that does what SCT / Diablo does inplace of the module (they should take the module of the market).
So there you have it. The tune is GREAT but the module itself can fail.

 

I have a friend who bought a Jet PCM for his 05 GT. He had one in his diesel truck and liked it. His car was stock and he ran some acceleration tests on a back road, then installed the module, after 200 miles he ran the same tests, no difference from the stock results. He sold the car (wife didnt like driving it, should have got rid of her). He gave it to me and I did the same tests with my then stock 06 GT, I saw no difference either. Then I went to my Brenspeed tune and CAI, NOW THATS A DIFFERENCE! So I certainly cant agree with your opinion.