I NEED SOME PROFESSIONAL HELP !

[blueroadster]

i replaced the clutch on my roadster in a well known smart garage , after the replacement i started to hear a hiss (like pressurized air sound) from the engine ,and i realized that its happening after my air pressure indicator (the turbo pressure indicator )hits 0 ,
from -0.5 to 0 no sound at all from to 0.5 and so on the sound is there .
the mechanic told me that its normal its the sound of the pressurized air from the turbo form the boost etc...,
but how come I've never heard it before the replacement if its normal
i want ur help guys ...
is it normal if not please try to solve my problem

[Evilution]

The garage probably removed an intercooler pipe or something like that to get the clutch out. Either something hasn't been put back on tight or a pipe has a hole in it.

[tolsen]

I bet the garage has caused lots of damage. Have it checked over by a smart mechanic.

[Big Performance]

Why not take it back to the garage first ?

[tolsen]

Why not take it back to the garage first ?

Looks like he already did that. Poor car repairs and servicing is too common. Mechanics these days do not possess the required skills and pride. Read a report someone did on a Smart 450 that underwent surgery at a major Smart Centre in Aberdeen:

[blueroadster]

i did he tried to convince me that it was normal ,it appears that it's not ,i'm gonna force him to re fit all the pipes ,there is no lack of power or performance in any way but im worried that it might cause damage to my turbo /engine ... thx for telling me its not a normal thing