John, you do know that the BMW 635/735 AFM is a plug & play swap that flows more air? (Bosch part No. 0280 203 027)
https://www.ebay.co.uk/itm/028020302...0AAOSwSO5a2cpM
https://www.ebay.co.uk/itm/1988-1993...4452%7Ciid%3A1
Tim Pollock is the guy you need to speak to:- https://www.google.co.uk/search?sour....0.Fkey6xXcLP8
Griff




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