I just got my Cobb AP in and flashed my car to stock stage 1 91. Right off I noticed the car needed me to push the peddle a bit more than before to get things going (I read this so I was expecting it). The thing I am not sure of is the car now sounds louder than before. Nothing outrageous or anything, but if I were to try and explain it, it kind of sounds like I have an aftermarket exhaust (which I don't). It's when I am cruising along lightly on the peddle, its like a rumble bbbbrrrr bbbrrrr. It seems to go away when I get on it and go into boost. I drove it around for about 25 miles so far. I couldn't pull any logs because it's raining like crazy and it wouldn't be safe.
So is this sound normal after going stage 1?
How long does it take for the throttle response to improve?
Thanks in advance guys.