i just installed vf23 with stock injectors n pump it running fine also it runs smoother than tdo4 16psi
it kind of slow at 1st and 2nd , but when it kicks in from 2nd to 3rd it feels a bit faster than stock. right now have turbosx stage 2 n running 14 psi to be safe bc with out tune n pink injectors. but have a little problem after the car cool down, it start making noise at 2000rpm to 3500rpm it sounds like exhuast leak! but i did check it it look fine the bolts are tight. anybody help??

b4 vf23 mod
kdm header
mbc
turbosx unichip stage 2
blitz cat back
perrin uppipe n downpipe
blitz intake
ground wire
16psi

after installed vf23
everything same but the turbo n uppipe
vf 23 n flex uppipe running 14 psi

 

Please better define the sound engine noise or a hissing sound. . . . . After cool down?
Rough idle?
Meaning after you have run the car hard and it is sitting in the driveway?
Or possibly after you have driven in hard turned it off and restarted it?
Did you buy new gaskets for the turbo or reuse the old ones?
Do you have a boost gauge? And does there appear to be a boosting issue, like aq vacuum line issue?

 

normol driving every time from 2500-3500rpm, it sounds from the rear muffler. i checked it. it looks fine, it sounds the muffler hitting something.