catless midpipe
Hi I got one is made bu protosport/circuitsports catless 2.5 with new gaskets,hardware 2nd o2 sensor bung with the 02 mechanical sim!! (that way you don't have to cut or splice your wiring!) $200 shipped and insured to your front door via fedex!
I had she same sound on my car it ended to be the wastegate actuator diaphgram that was defective! I recognize the loud whistle sound! Don't look for anything else!! that's the problem!! Take it to the dealer if is still under warranty, they will replace the actuator for free with an upgraded one!!