I made the manifolds myself from a set of big block a-body fender well headers, not much left . The Turbos are T3/t4.

GoGreen, I think the extraordinarily short distance from the head to the end of the downpipe is what makes it loud, plus it is idling around 1200. give or take. you have long tube headers leading to your turbos, then the downpipes reach all the way back to the firewall. my turbos are 6" from the exhaust port and the downpipes are only 18" long. I haven't gotten enough boost to see if the wastegates work. I have 8lb springs and I've only achieved 6lbs so far. the blow off valve certainly works