thats not true dave and has been proven in the spool up test thread Russ started a couple years ago. i also have first hand info from andrew that use to be on here with a truck like mine and triple 366's. even billet wheel'd ones are no where near as quick spooling as stock when put into comparable situations with outside variables made consistant between the two chargers.
the only way a 366 or 369sxe will spool like stock is with the converter unlocked and having a converter that matches the turbo. soon as the converter is locked, spool up will be limited compared to stock. i would bet money that 369 wont start making boost till 1800-1900rpm MIN where a stock one will make boost as low as 1400rpm.
Corbin, if you want quick spool for towing and are picky about it actually spooling fast, twinning the stock charger is the best route. otherwise you will be adjusting shift points to down shift sooner and playing with MAF fueling or throttle based injection quantity to get it to stay on the light smoke side.
Id love to see someone with a 369 do the spool up test. that will tell you just how far behind 369 is from a stocker in spool up