I have avoided making comments and didn't want to take anything away from the OP, but some comparisons keep getting brought up that I must clarify.
IMO: $5000 is REAL steep considering most of the Buick owners don't use all those options and run the stock ignition. Are you forced to run CNP with this ecu? Does it use the factory crank, cam, and other sensors? Boost control and flex fuel control are already incorporated in the $1900 xfi complete plug and play (car can quickly be returned back to stock) package at no additional cost. Every XFI purchased from me comes pre-programmed with a custom start up tune and FREE tech support for the entire time you own it.
If a customer wants to run a distributor, the XFI plug and play harness is only $75 plus ignition components.
If a customer wants to run CNP it is $1400 INCLUDING brand new GM Coils, brackets, plug wires, etc.. and is 100% plug & play. If they have coils, brackets, wires, it's under $1000
If a customer wants to run a 4L80 transmission the controller is $618
The ProEFI traction control appears to be geared more for street use (comparing wheel speed sensors), where the XFI is geared for track use. If a customer wants to run ITC that it's a $400 option.
So IF a customer wants to run flex fuel, boost control, CNP, traction control, a 4L80E transmission the XFI cost would be $1900+$1400+$618+$400=$4318 before any package pricing discounts. It would be under $4000 if they already have a MAP sensor, coils, brackets, etc..
I don't mean to come off in any "advertising" manner here but I can answer these questions and was asked to do so.
Yes the ProEFI uses the factory crank, cam, and other sensors
If a customer wants to run a distributor, it just needs to be wired up. No additional parts need to be purchased from ProEFI.
If a customer wants coil-on-plug, there's just the cost of the coil packs themselves and however they choose to be mounted. No additional parts need to be purchased from ProEFI.
ProEFI Traction Control is completely free and built-in without any additional purchase to "unlock" features.
ProEFI Traction Control can be setup for a number of people. Most of the cars that leave our shop are street cars which is why the TC is set up for street use. There are plenty of race cars running this system that use an entirely different manner to manage traction called Launch Control which can be operated off of engine rage of acceleration, wheel speed differential, and many other strategies. There are 6-second drag radial cars running on this system so race cars work just fine.
Flex Fuel features yet again are all built in and only require the addition of the sensor. With the Flex Fuel setup, you get the failsafe built in that limits boost by ethanol content. The same goes for all other features like Fuel Pressure Compensation (variety of strategies to accommodate for any lean condition based on fuel pressure which is very common in the boosted world).
4L80E or any automatic transmission controls are all again built into the ProEFI with no additional components to be purchased from ProEFI.
Lastly, no systems cost $5000. For obvious reasons, I can't get into pricing here but I will say that after everything is installed and tuned, it will approach that dollar amount. The systems themselves are much less expensive.
Obviously there's a recurring theme that there are no features that must be unlocked (save only for V12 applications where the firmware is different) at a nominal fee. All features are readily available in the system, bar none. The most you have to buy for a particular feature is a sensor to monitor it. The other recurring theme you'll see with ProEFI is integration. There's no external boost controller, transmission controller, fuel pressure monitoring, oil pressure monitoring, flex fuel, nitrous control, traction control, gauges, etc. needed with the ProEFI. It's all built into one, all inclusive system that communicates constantly with itself.
Is it the cheapest system? Absolutely not.
Is it on the top-tier as far as quality and functionality goes? Definitely.
Again, I don't mean to make any advertisements at all. I just mean to answer some of these questions.
Reid