Jimbo,
You are hearing the recirculating blow-off valve (really the surge valve) emptying into the intake pipe. You did not notice this due to the silencer built into the stock tube you replaced. The noise will not surface until the turbo has spooled up. A brief tap of the throttle will not create enough boost that warrants surge valve venting.
To be sure, make sure the hose from the surge valve is connected on both ends. There is a chance you may have pulled it off when you removed the stock intake tube or installed the FIPK tube. I know, I did it when I put the MOPAR BOV conversion kit on. I had to remove the intake tube to access the surge valve bolts.
Report with your findings!
Scott
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