I was/am in the same boat as you. Do I need this? I researched it on Cobb's forums before they closed last month and found a posting from Cobb stating that our current gen STI's boost controller is good enough, but earlier gens would benefit from it. I was surprised a honest answer! This was from a Tuner though, not a Sales Rep. As I too had a Sales Rep say I should get one before I get a ProTune here in Cali. I never called him out on this like I should have. Fast forward to today. I have a Grimmspeed setting on my table waiting to get installed before my Protune, although it’s not at Cobb. Good luck with yours.