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Wow. That is exactly what came out of my mouth when I saw this supercharger kit at Bimmerfest. In all honesty, it was my main motivation for attending the event once I heard it would be there. Some people may be reading this and wondering what the big deal is as superchargers already exist for the M3. That is true, superchargers do exist, but they are all centrifugal style blowers. This is the world's first positive displacement supercharger for the S65 V8. Why is that a big deal? Because it's a completely different type of blower with completely different power delivery. This is the solution for those who complain about the M3's torque or for those who do not like the response down low of a centrifgual blower which needs rpm to make boost. This style of supercharger is always making boost, from anywhere in the rev range. That is what makes incorporating it on the S66 V8 difficult with its independent throttle bodies as positive displacement blowers usually are set to pull air through a throttle body not blow into it. The centrifugal blowers send air into a manifold. If a positive displacement were to use a similar setup it would be blowing air in while the throttle bodies attempted to close as it is always making boost. See the problem? The solution Harrop Engineering came up with was a manifold that fits in between the throttle bodies with a bypass valve fit that relieves pressure as needed and makes sure boost is not made as throttles are closing. Pretty trick setup eh? You can see the design in the photos and also how tight the packaging is. I do not even want to know how many hours were put in trying to get this all to fit. The blower employed is a TVS1740 unit from Eaton. This is a roots blower and likely will be set to 5.5 psi or so initially. Boost from this blower is different from a centrifugal and will be harder on the stock rods since it is at full boost right away. Expect horsepower in the low 500's to the wheels. Oh and see that little black box to the left of the manifold off a metal area at the inlet? There will be electronic boost control which is likely the first of its kind on a positive displacement setup although I am not able to confirm this. Different maps with different boost levels for different fuel? A possibility, yes. This is a big deal and an engineering feat for the S65. My complete and utter respect and that of this network to the guys at Harrop. There is still work to be done here. It is not quite ready although pricing is initially set at $12,990. There is still a lot of tuning to be done but this will be coming eventually. Pictures below, much respect Harrop and it was a pleasure meeting you guys at Bimmerfest. You were incredibly nice and answered all my (MANY) questions. Thank you:

Great video here of three runs at the PBIR (Palm Beach International Raceway) between a McLaren MP4-12C and a Porsche 911 Turbo S PDK. Oddly enough, the McLaren seems to rip the 911 Turbo out of the hole on the runs despite not having all wheel drive. It's fast, very fast in the first run turning a 10.6@134 to the 911's 11.0@125. On the second run the McLaren gives the 911 Turbo the hit and seems to just barely run it down but the times are similar with a 10.6@133 for the McLaren and 11.0@126 for the 911 Turbo. The 911 Turbo S is a terror on the drag strip having shown a 10.7@127 in stock form and even a 10.6@129. That was in seemingly better weather though and the Florida PBIR strip isn't the fastest when temps start to heat up. This MP4-12C likely has the new software update which bumps output by 25 horsepower. On R-Compound rubber we have seen a 10.3 1/4 mile out of the car completely stock. It's simply quicker and faster than the 911 Turbo S, video below.