you need if you don't already an adjustable actuator (hks, toy tuning) and a boost gauge to see exactly what you are boosting at, then all you do is wind the adjustable actuator down until you can drive go onto boost and not hit fuel cut (under 0.8bar) it might take a bit of adjusting to get it right, but this is the cheapest way unless you have a boost controller in the car to adjust it that way. actuator= £80 boost gauge (dependant on quality) = £20-100 hope that helps mate.