Car Stalling When Coming To A Stop ~ New Turbo Installation

[MariahCarey]

Hi guys,
Car is at the workshop now and I has had a new HKS GT-RS Turbo installed.
Car is fully tuned running 268rwkw.
However, when I'm going high speeds and coming to a stop fast the car will stall.
Theres no BOV, just the standard plumb back and its not blocked off either.

Any idea what's wrong? Mechanic seems to think its the intake pipe, but it wasn't doing it with my old high-flow

Thanks

[GTSBoy]

So you've not changed the IAC stuff at all?

Other question......define "fully tuned". What does the tuner have to say about it shutting off on decel? What about logging?

[MariahCarey]

Thinks I need to make a new intake pipe

[Ben C34]

Yep

[Blackkers]

You've got the standard r33 Intake pipe? You were lucky to get 268kw; that's more than I've seen before