I am running my stock 2 1/2 inch exhuast tubing with just my pre-cat and a hollowed out 2nd cat...and no muffler and when im at full throttle im getting a pretty loud whistle through my exhuast...I know that a whistle like that can sometimes meen im have some sort of turbo leak but I dont have any leaks and my boost is great... so I guess im asking if anyone else running a mostly open exhaust has this same whistle????

Never mind I fixed it fully open exhaust now and sounds good