Does anyone knows about this noise my FD makes; it sounds very deep, rich sound just like any other car with an aftermarket exhaust during WOT then around 4,500 RPMS the deep sound changes to a whoossssss til redline, kind like the old cop cars sounded while going fast. It makes this sound with the factory system too just less noticeable. I suspect the main catalitic to be plugged because of low dyno figures(210). Thank you for any inputs.

 

sounds like you have a boos tleak on the secondary turbo.

 

no; i have 10psi all the way( running non-seq) and it sounds from the back definatly from the exhaust.

 

Yeah I get that sound to it gets like that when your over 4500 rpm right? I heard its the secondary turbos kicking in at their peak, but It feels like the engine sounds like its cutting out right?

 

maybe its your 4 ports engaging

 

On an FD?

 

Check the bearings in your rear wheel