Originally Posted by sanchez

just got my car back from the dealership today to try and fix a problem i am having i got an 09 ss tc with the gms1 on it when i first got the kit i would boost 17-18 pounds and today i brought it into the dealership cause my boost has dropped down to 12 pounds i also have the k&n intake on my car so anyways the dealership told me i threw a code on my maf sensor and that they cleaned it and that everything is fine so i took my car out for a drive and im still only boosting 12 pounds nothing more they also told me i have no boost leaks so now i dont know where to start cause when the gms1 was first installed it was a huge gain boost shot up no problem and seems that over the last few months its slowly been going down i have however also noticed that when im driving around and off the throttle the vacumm is way down like 60 70 when that used to be about 20 on the gauge so im not sure if that has something to do with it or not any help would be great