There are no sensors in my pipe that when I took the lot apart! [

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The restriction from the original plastic pipe was quite a lot [:O] as it narrowed from 60mm to about 20mm and then to 50mm. It now has a trimmed 1.8T intercooler pipe (S shape and cost ?2 from a scrapy) that joins onto a peiece of stainless steel 54mm bore pipe that has a 45 degree bend (free as its been in garage for ever), which then joins to the original rubber inlet body hose to finish it all off.
This and the cleaning of the inlet body on the manifold made a noticable improvement. She smoked for about 5 miles when driven after mods as I think the ECU was used to supplying more diesel prior to the restrictions being taken until it adjusted itself............now she hardly smokes, even if pushed hard and the extra torque and top end increase is great. Going to clean the inlet body every 3 or so months to keep on top of it.
NEXT: Clean out the sludge from the intercooler