[Burt4x4]

I have it on my 454 and I LOVE IT!
Throttle responce is AWESOME.
Now my 454 is not stock so it purrrrs and has tons of power.
This is my first FI system and so far it is working great!
I had a hard time tuning it so I took my truck in for a Dyno Tune and had it tuned properly.
If you are thinking of buying a used Pro-Flow setup you will have to buy a new chip from Edlebrock to match your cam specs in your engine..they burn the cam specs to a chip that goes into the ECU.
I would also make sure ALL the paperwork/operation manual comes with the setup along with the hand held controller. There are also alot of parts it comes with new, like fuel line, electric fuel pump, Dist convertion kit, etc...
Get a parts list of a new setup and make sure the used one has ALL the pieces.
.02c

Good Luck