Is the divertor valve on the inlet side?

Something was replaced on my octavia by Des Winks as they said it was seized and wouldn't move proply, on the Inlet side, can't remember name of it, was just wondering if this cudda been the divertor valve, if not il be gettin it replaced..

As I have noticed, coming onto turbo at 2500 then it puts you back, but then kinda slightly looses it and then comes back again ever so slightly

Don't you have a receipt?