Just wanted to post I dynoed my car before and after gms maf and lost 10 hp and 19lbs tourqe. I used a air fuel monitor the car runs rich the whole way through power band.With the stock maf, screens removed car runs alot closer to perfect mixture. I dont know if this is just how my car acts. I also did some quarter mile testing after a learn time of 200 miles. My mph dropped about 1 to 2 mph, same 60fts, temp and track conditions. almost identical.