after i had turboed my gsr i can't hit redline..it only hit 6500 before it acts like its hitting redline.i have t3/t4 .57 .63, 550cc injectors, 2.5 d.p., 2.5 exhaust, straight pipe, phearable ecu,255 fuel pump,2.5 fmic piping with intercooler. im only boosting at 8psi

its it my timing? my ecu? what am i missing?

 

Is it tune? or is it on a basemap? If your on a basemap, I think it's bogging.
Go get it tune.