Is my exhaust too small?

[b16coupe]

Here is my setup:
b16a
t3/t4 turbo 8psi
dsm 450's
uberdata (base map right now with .9 degree retard for every psi)
A foot and a half section of 1.5 inch exhaust pipe

About 4months ago i had the resonator removed off of my civic, and the shop put in a 1.5inch pipe in its place (i didnt realize it was this small until today)

When i floor my car, it will spool up slowly to about 8 psi and start jerking a little bit at around 5k to 6k rpm and wont rev any higher (it isnt a rev limiter though). I was wondering what all of you think it could be. I think that it is the exhaust being too small but could it be something else that someone has seen in past?

Thanks in advance

 

[handlebarsfsr]

any turbo should use an absolute minium of 2.5", if not 3 for best performance. 1.5 is stupid small, your killing your performance, not to mention your egt's must be sky high from the backpressure and reversion goin on in there.

 

[phunky.buddha]

1.5 inch is the size of the stock exhaust, if not smaller...

 

[posol]

you're better off just running open manifold/downpipe at this point.

throw that useless shit out.

2.5 minumum