ummm that's not a Blitz valve, it's a Bailey...
anyways yes you will ideally need a new intercooler to throttle housing pipe to get rid of the cold side version you have there now. You will also need the pipe that goes from the metal charge pipe you have blanked off circled in red in your picture to the stock DV position on the turbo inlet pipe (TIP) you have circled in blue. See if someone is breaking a Golf or recently replaced theirs with silicone items to get the ones you need