i dont know which one to choose from. I heard that they both pritty much do the same thing? whats the diff between the two, is on better to buy then the other? Help me out here, who ever has either bc let me know if its worth getting cause ill spend the money for the greddy but i would also like to save money by buying the AVC-R.

Its more about personal preference, i have asked around about this, most will recommend Blitz, but shops i've been around here in Cali that do Forced Induction just recommend a MBC, the reason is price vs. function.

yep, MBC or Profec B II or type S,

AVC-R will give you a headache unless you like something blinging blinging inside your car.

Actually the avc-r is an amazing unit and easy to use (once you figure it out). I run the avc-r along side with my E-manage unit. Im not sure on the profec features for boost control but I know the avc-r you can set gear based boost which is why i bought it. Im sure they have the same features as far as rpm based boost, data logging etc