It will turn 5500 no problem but with everything being 100k mile stock parts with this much boost I've stayed very conservative with the rpm. Another reason I keep the rev's low is that I sized my wastegate too small and I get boost creep around 4200 and it gets worse with rpm. I've got to add another wastegate to solve that. I built myself into a corner when I installed this wasetegate and didn't leave enough room for upsizing so a second wg is my only option right now.