I started a post a while back about them i had one on my 3 door & loads of ppl said they are restrictive so andy was going to pick his engine up from harvey & was going to mongoose as well to pick up a few fiesta st exhausts so he picked me up a 3,5 mongoose system. With the scorpion my car wouldnt boost by 25 psi you could wind the actuator up as much as you want , its running p8 with air injectors. so i got the mongoose fitted today & the car is now hitting a boost limit at 32 psi & all i have done is change the exhaust.Just shows how restrictive these fuckers are need only put half a hole on the actuator now & hopefully should be right enough