Well, My AEM Meth Kit is on the way, my Berk HFC just arrived. I figured It would go well with my Meth Tune, maybe yield a few more HP, anyone have this with the Greddy Kit & experience Boost Creep/Spike?

 

if your going from the stock cat to the HFC. you WILL notice an improvement. especially when revving the motor. the car will breathe easier.

 

I've had my HFC with my Greddy kit for about 3K miles now. boost is pegged where it was set 3K miles ago, no spikes whatsoever.

 

I'm running the HFC but my fuji exhaust is pretty restrictive thus I don't spike etc. With your invidia and the HFC my money says your going to spike. The only way to fix this with an internal wastegate is to port the flapper.Used to happen ALL the time with sti's and 7cm turbos. the flapper could just no flow enough gas....

 

yeah, we will see with the METH I woul imagine a spike to 12psi (if tuned properly) will be no big deal, we will see. Also I only spiked with the Test Pipe in <50F temps, so hopefully the HFC is restrictive enough.we will see