Well i just installed my max rev kit, etc yesterday and it is on a 97 GSR motor in a 00 Coupe...I had been running a p72 with hondata s100 for my toda set up so i took that out of course afraid of the crazy timing advance...I slapped on a 00 Si ECU...and the car idles pretty close to stock and drives fine...but then when i take it too like 5500 onward...the car studders...seems like its starving for air..almost makes the car shake....any idea what this could be?
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Are you running the GSR manifold? If so, then I would wonder if it is opening the secondary runners in the intake. The motor will starve for air if they don't open. Can you hear them?

 

i cant really hear them no but im not exactly sure.