I had fluctuating boost issues and a very apparent flat spot at 5k. I replaced all the usual suspects DV, PCV, cam follower, MAF,and plugs so I thought it was fuel related but after logging with vcds it didn't look like it. I bought the wastegate as a last ditch attempt at sorting it thinking it was bleeding boost but this was a costly mistake! I contacted superchips on numerous occasions and got the standard "well everyone else is on the same map with no problems" but they did send me 2 different maps which didn't make any difference. Put revo stg 1 on it and problem gone!