Henk,
What a great part! I installed this right before heading out to 944 Fest at Virginia International Raceway, It was really easy to install, and the instructions were easy to understand, I did have to re-wire it at the throttle control valve due to polarity issue that was described in the instructions so no problem there, fired right up! the idle I noticed right away was 200 rpm lower, but I made no adjustment, I liked the lower idle, did a trial run around my area for a shake down, then it was on to the track, right out of the gate at tech inspection they noticed that it was different than other MAF kits, asked where I got it, how it worked, they were shocked it was plug & play with the stock DME! once on the track I could tell that throttle response was improved, sometimes that is mis-leading, but what was un-deniable is that the top speed of my car is 11 mph faster with the MAF installed, a gain of perhaps 2-5 HP? at some point I will try to establish a fuel consumption comparison. OUTSTANDING upgrade for any 944!