Read about these screamer pipes on turbo external wastegates. Can anyone point me to some more info on this topic?

THANKS

__________________
2011 Prius

Is this anything like putting a washer in the tail pipe to make it whistle?

Well.... sort of actually!
Only it would be located between the exhaust manifold and turbo unit, replacing the internal wastegate, to blow off excess exhaust pressure the turbo cann't handle. On boost, it apparently generates a deafening, jet-like scream that Ferrari V8/V12 engines are famous for

Quite illegal aswell, I believe..., like most of the big fun things in life

__________________
2011 Prius

Maybe this is what you want:

http://cgi.ebay.com/ebaymotors/Fake-Turbo-Sound-Whistler-BOV-Integra-Civic-Prelude-RSX_W0QQitemZ7996916661QQcategoryZ33633QQrdZ1QQcmdZViewItem

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car