This is true.
I had a M90 series III 3800 motor Dyno 425hp (all the goodies) at the wheel with the 4t65-e HD trans (ruin alot of trans before i got it right). Running a 3" pulley on the M90 at 5000 engine rpm will produce 400+ degree of hot air.I use to monitor the blower outlet temp with a AUTOMETER dual channel Air temp sensor ans gause. all air temp test was done with the blower strap to the engine running in a car driving around town. I have try many different ports, not worth the gain when compare to the work involve. Improvement can be made, and if any maybe a 5-10% gain with out a pulley swap. The M90 also eats alot of HP from the crank. a 490hp flywheel/flexplate motor will put about 375-380hp at the wheel/tires. Some of this is also lost in the automatic trans. Spining a M112 just eats more HP and only produce 22 cu-in of more air that the m90. If you do liquid-intercool the M90 you can expect to see a 50% drop in blower outlet temp. Add a ice box/moroso in-line with the flowing liquid and you can see a 70-80% drop. the is more likly for the track.
When the m90 is intercool. the blower outlet temp will change. the lowest i have ever gotten a liquid intercool m90 with ice was 125 degree temp at the outlet winging the motor at 5000rpm, t-stat and fan at 160 degree. Since the blower temp goes from 400 degrees to 125 degrees when intercool the fuel curve will also change and you can put more timing into the motor, so all you hp is not comming from boost. the additional fuel and tighter timming will add up in hp. this will be notice in the exhaust sound.
The M90 is still a good quality/durable engine air pump for street application. I have seen 100,000 mile with no problem, with service and oil change this blower will perform like OEM like the engine.The trans is knowen for broken diff, chain, input shaft, anything else is normal due to torque over-load.
The twin-screw is owen by a company in germany. I believe whipple is the U.S. distrubutor for twin-screw (lycos) blower. Thes blower make boost like a turbo, but the boost comes in very early. most of the time you will see maximun boost at 2500 engine rpm with the twin-screw blower. This early boost shock can hurt and damage driveline parts. Don`t get me wrong, this is the blower of performance, and so should be everything else behine it, or you will twist crankshaft, blow trans (normal), damage axle. the blower is too serious for a gasoline engine air pump, maybe if we run NITO or METHNOL. A true winner in races the twin screw...I believe NHRA is now runing twin-screw in most top-fuel dragster and funny-car.