screamer pipes on an internal wastegated turbo are pointless in my opinion the reason.if they are noisy at idle something is wrong either your gaskets are gone or exhaust gases are leaking out through the screamer pipe or your internal wastegate is fucked or leaking either way you car won't pass an nct if it is noisy at idle.

Someone tell me tho what would be wrong with welding up the wastegate penny and using an external wastegate it serves the same function as a boost controller and u get a class noise at full boost??apart from using the standard manifold whats wrong?