So I started up my car today for the first time in a week and after filling it up, i took it for a drive. I noticed that when i accelerated hard it began to surge a bit and feel like it lost power. Slow acceleration was fine and no issues. I am guessing that it is a turbo issue. Also when I got home i noticed that the exhaust smelled a bit rich and the inside of the pipe was black. I am guessing this is a turbo issue. Any ideas? I was already thinking of changing out the turbo control valve and turbo bypass valve, so hopefully thats the fix.