Here are the main differences. I haven't compared the two side by side so I may be missing some things.
Our kit uses all steel braided line. This was done for two reasons. First, in testing, we originally used a different type of line. There have been some problems with that car showing wear on that line due to vibration. While it could have been eliminated with installation changes, I don't want anything out there that could potententially cause problems so we went with all steel braided line.
The other reason for doing this was to minimize any objections people may run into at their local track. NHRA has a limit on the amount of rubber line allowed in fuel systems. While they may not consider the propane injection a fuel system, I didn't want to leave it open to chance so we used all steel braided line. There could still be some remaining issues like a firewall, etc seperating the rest of the car but that will probably have to be dealt with by the end user. The rules are a bit murky about that.
We have electronics inside the car that allow you to change the cut on point of the system and control the amount of propane injected via a control module that allows you to pulse width modulate the solenoid. This allows for tuning on the fly.
We have a custom made propane regulator for pressure control. The IPO kit also uses a regulator and I am familiair with the piece they use however we wanted to have control at over 100 PSI of tank pressure so we had a regulator constructed for us from scratch. The company that designed and built the regulator had EVERY engineer in the place examine it and sign off on it before they would sell it to us. It has a ridiculous inlet pressure limit and 400 PSI outlet pressure control. It also has an inlet and outlet pressure gauge.
Regulator photos
Regulator 1
Regulator 2
Regulator 3
As was pointed out in another thread, yes, it looks like a welding regulator, no, it is not. There is a sticker attached to each regulator that says "DANGER: DO NOT USE FOR ACETYLENE SERVICE". This is the real deal, 100% constructed for propane use only.
Along with controlling the pressure and allowing you to pulse width modulate the solenoid, we also use jets up front at the engine that allow for more tuneability. The IPO kit uses a needle valve. Accomplishes the same thing pretty much.
We use a nozzle for injection, I believe IPO uses a standard hose barb you thread into your up pipe. Our nozzle can be mounted in metal or into hose so people with front mounts can put it down underneath the car in the intercooler hose and it would effectively be hidden.
Out kit ships with a tank and a custom made mounting bracket. IPO's kit does not ship with a tank. Im not sure about a mounting bracket.
Our solenoid is a custom piece, designed for our use and has a very large orifice for maximum flow. It's bigger than any nitrous solenoid I have ever seen. For an idea of the size, click
here. Please note diet Pepsi does not endorse propane injection.
That's about all I can tell you at this point.