Subaru WRX Engine Low Power

The Car Is Actually An Sti. I Was Driving It And When I Floored It I Felt A Huge Power Loss And When I Accelerate There Is A Clicking Noise...

After About 30 To 40 Secs While The Car Is Running It Boggs And Looses Power, I've Tried Changing The Fuel Pump(twice) Checking All Ground...

When Turbo Usually Kicks In, The Engine Makes A Very Audible Whooshing Sound And Wont Rev Up Any Higher And Actually Loses Power. The Boost...

Will Not Accelerate Seems Like It Is Hesitating As If Its Not Getting Fuel I Had Half A Tank I Did Get Codes Po420 And Po 171 But My Cel Is...