i have a 2004 octavia vrs

when i brought it a month ago i couldnt hear the turbo but latley i can hear a whistle over 2000 revs

can the turbo normaly be heard or could this be a air leak somewhere have had it on a smoke machine but couldnt find anything

also when the boost builds up sometimes i hear the air coming out of the dv when taking foot of the pedal

cant remember hearing this when i first had it neither is this normal

might sound dumb questions but when brought it was fairly quiet

Post it up in the mk1 octy section m8 not many peeps read this one as it's for technical info and how to guides.