It's expensive, but it seems to be the only thing out for the Co SS, is it true?

Sorry what is HyperPac?

so far the hyperpac is all i seen so far. but everything i seen on it, all it really will do is monitor the sensors in your car so YOU can adjust the settings... i didnt see anything on how it will actually change anything but monitor the car.....
i ended up getting a PDA and went to a aftermarket site and orderd a monitor kit that will work in any OBD2 port vehicle, it also cleared and hides dtc's/ck engine light. it came with a obd2 plug/wire and a software disk to install to pda... it worked great. even gave a 1/4 mile, 1/8 mile hp and torqe ratings....

i only paid 500.00 for it al including the pda on ebay... compared to the hyperpac, i saved quite a few pnnies and i was able to watch over my whole truck.... and one day soon enough it will be going into my car...

hope this helps...

If your putting it in your car it will have to be able to work on high speed lan systems, Or have Candi capability.