Umm seems to be ok, not really driven the car much tbh, just tightened up the clamps a little more, just to see if that will stop the noise, I think it's just a whistle when the car Is on full boost, cos the whistle noise does go away at high rmp, will have to wait and see when I take the car out next I guess, but car seem pretty quick,,, hard to judge, as I've not had the car long, and it hasn't been long since i changed it to the neuspeed