I've run a Hutley adjustable MAF for the past 3 years. It is full adjustable at idle, med, high and acceleration. Its hard to say how fast it is compared to a stock 911 since I haven't driven one for a long time. My track experience in chasing down cars is one area that tells me its running good, especially with later model cars. The torque and hp are still at the top end of the rev's, to the point that the car almost feel turbocharged. The power feels incremental all the way to redline. Adding Steve W's chip in addition has also helped. Do they work? Yes. If they didn't, they would'nt of switched to these in the 993's. What convinced me is that if you club race and have one of these, you get bumped up 2 classes.
