I have the V2 non-intercooled (identical to V3, but oiled from the oil pan, not self contained like the V3).
I have an automatic trans, which dynos about five percent lower than a manual, and I dyno'd on a Mustang Dyno which tends to read about ten percent lower than a Dynojet. Also, my engine & exhaust are 100% factory stock. Car makes 364 rwhp at 6,400 rpm's (shiftpoints) and 380 rwhp at 6,800 rpm's (redline). That works out to about 450-475 hp at the flywheel.
Last day at the drag strip I ran back to back 12.34's @ 111+ in the 1/4 mile. 1/8 mile was 7.89 @ 90+ mph. Even though centfugals like to rev, my 0-60 mph times have dropped from 5.1 stock to 3.7 now and 0-100 mph times have dropped from 13.7 stock to 9.9 now. A manual trans car may possibly go quicker than mine as more power gets to the ground.
That Brenspeed V3 kit is a lot of power for the money.
You're right - good numbers for the money. I only spent $4600 total out-the-door for the V2 kit & installation. Custom dyno tuning added a few hundred to that, as I had some special requirements for auto trans & converter operation to work with that manual trans cars don't have to fuss with.
With all the the twin screw kits going for $5500, $6000, $6500, and more, with installation on top of that, you're looking at $6000 to $8000 out-the-door for a twin screw. My budget restricted me to a non-intercooled centrifugal, and I couldn't be happier with how well the car performs. Excellent bang-for-the-buck!
Just about every supercharger kit on the market will get you into the mid 12's (or better), so shopping by price is the way to go. Vortech & Paxton centrifugals are reliable, proven, and very inexpensive. Keep us posted on what you buy and when it's installed. We all like to compare here!