I know nothing about this situation but we have issues with this particular engine at work. Turbos are always coming in majorly carboned up due to the poor running of the engine. Same engine as what's in a Nissan qashqai if I remember correctly.
https://www.youtube.com/watch?v=rqNs1efUsuk Listen to this Amjad, this was a long long time ago. 0.4bar, Internally gated and just a Filter, HKS SSQV and the Buddyclub. Need to get a new video with the RW system, and TD04 @ a bar now.
Like I said on Facebook feel free to come and have a go in mine and see what you reckon?? Mines straight through with just a tiny resonator box right at the back and it's mega loud!