So ok look at my si and see what i am running then tell me what kinda changes i will see and feel if i was to block off the wastegate tube i am just curiouse and wil it help any with fuel milage

What kind of boost are you seeing now?


its not recommended to block off the wastegate. its there for a reason.

I doubt it will help with mileage, I haven't noticed an improvement on my truck, mileage wise. I noticed it pulls a little harder throughout the RPM range, as more air can be rammed into the cylinders.