So.. I'm completely New to forums first of all. I have an 09 ss turbo, it has a trifecta tune with Hahn exhaust to an HKS muffler. That's all lol. I've had the typical code of too much pressure in the gas tank, super easy to fix, gone in 2 hours. But recently I've had the code of p0100. I changed the mass air flow sensor and also put in a New filter, cleared the code and its back on next time I start the car. I haven't noticed any differences with how it is running, but there was 2 times where I didn't build boost in second gear..shifted and no problems. So any suggestions would be a lot of help, thanks!