Fuel cut or boost cut?

[Cow]

Guys,

Initially before I change my exhaust, my boost was set at 0.9bar and at full-boost there is no drop or creep in boost.

Now after I change exhaust, I notice that I can't hit full-boost at all, the boost will spike until 1.1 - 1.2bar. and when it does, the car bogs and the exhaust got loud bang sound.

is this fuel cut because my fuel pump not delivering enough fuel at hi-boost?

advise pls..thanks :)

 

[azizi.aziz]

...did u notice at what rpm the 'sound' occured??? if around 7500 and u running wit stock ecu.. i think it's fuel cut...

 

[Cow]

azizi.aziz: i didn't notice at wut RPM, but as long as the boost hits 1.1 or 1.2m the car will bog and then followed by the sound. yeah i'm using stock ecu