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Why not go for an electronic boost controller with a built in fuel cut defender, two boost settings and a scramble facility for higher overtaking boost, in cabin adjustable all for £140 delivered next day.
VERY good quality kit at a remarkable price.
They have gone up in the world now from a resistor to a variable resistor lolol
It isn't a boost controller but just a airflow temperature 'frig' which is not advisable