Find your local T4 specialist that does the map and pm them but no matter the cost it's probably the most worthwhile mod you will ever do to the car.
Stevestrat has a link to the T4 trader map on his sig.
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Glutton for punishment --- Previously ... 2.6 SD1 x 2, 3.5 SD1, 820S, 820Si x2, 216 Gsi, 220T saloon, 414, 45 1.4 x2 and now a Cowley 75 CDT 
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