Hi guys, recently did a rebuild on my 07 Hawkeye 4EAT JDM model. Comes with sports shift.

During the build i was looking for a setup that would be somewhat fun on the streets yet fast enough to play with them STi buddies.

After much tought was given, i decided to go Twinscroll and the build setup is below.

What was bugging me is after the tune was done the power figures didnt seem that much impressive at all considering how much i had already put into it.

4EATs aren't common where I am from so the tuner said thats the best he could do.
After pushing it past 1.6bar of boost, it wouldnt make anymore power and we were stuck at where it is currently.

So the question is, why isnt it making more even when he increased the boost?
Is my trans clutches slipping? How do i tell?
How would i be ablte to make more?
07 WRX JDM 4EAT with sports shift SAVCS

Links G4+
Ej207 lower case
Stroker 2.1 cosworth rods n crank
Mahle 92.5 Stroker Pistons
Ported heads
+1mm valves
Sti Cams
Cosworth valve springs
Tomei Adjustable EX cam
SC42 TS Billet
Hyperflow TMIC
Spec C EL headers
Spec C DP decatted
Spec C UP
Apexi Cat back
APS 65 intake
Walbro 255
1000cc injectors
Tomei FPR
TGV delete
12mm Oil pump
High stall TC
Modified valvebody
Hayden ATF cooler
HKS oil cooler
Koyorad Radiator
IAG AOS

Heres the graph.
1.6bar boost
Thanks in advance for the guidance.