Bought a green cotton panel filter to replace the paper one in the airbox.
What a difference! The lumpy throttle control has gone, the boost dropping in & out, gone. Now pulls hard right through the rev range. Arguably the best £35 I've ever spent on a car. I'm still not a fan of this map but at least it does the job now the engine can breathe properly.
Sometimes it's the simple things in life that put the biggest grin on your face
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