2 Different AMS Heat Exchangers

I was confused at first as well.

The AMS HE is double the thickness (and size) of the OEM at 22mm, and the AMS RACE HE is even thicker at 32mm.

Most of the aftermarket HEs, including the AMS HE, are a tight fit. The extra bits that come with RACE HE is to allow installation.
Any HE is going to be better than the secondary OEM HE that looks more at home on a watercooled PC.

The reason why the AMS HE is popular is because its one of the few parts that are available through Infiniti dealers. This means that most Infiniti dealers can install it for you, emphasis on most, potentially meaning a parts warranty and/or maintaining vehicle warranty. It's best to ask around: While the Infiniti HE is basically just Infiniti rebranded (and marked up) AMS HE, some dealers will not deal with it. (Some dealers would back in the years when the Infiniti HE was out of stock.)

Warranty or not, most still have the heat exchanger installed at their Infiniti dealer due to the high risks of when air is introduced into the coolant and in the case there are damages (under warranty), then Infiniti/insurance have a more difficult time blaming the damage on you.

I can confirm that infiniti can (and likely will) make you put the stock HE back on for any indepth warranty work. Ask me how I know?

I used almost all AMS parts believing infiniti would not deny a warranty claim based on aftermarket parts and when I had trouble, they insisted I restore the entire car back to OEM before they would work on it any longer. They spent $10k trying to fix an electrical problem so I'm not sure why they cared about a heat exchanger .. but they did.

This was infiniti of Kansas city so be warned. Ultimately, I had to fix the car myself which was better than restoring the car to OEM.

My advice; if you are going to install an aftermarket HE, get the biggest one you can afford. Cooling is like money and horsepower; you cannot have enough of any of them and for all the work to install it, what is another $200 to have the best protection possible?

I think we can all agree that the decision to modify the vehicle while still under warranty (whether factory or extended power train) will be a roll of the dice.

In my case, the problem was very difficult to find; the dealer charged infiniti almost $10k trying to fix the issue with no luck. They ultimately decided the easiest way out of the issue was to decline the warranty because the car was modified. If your dealer needs to call the infiniti tech line, they can and likely will inventory the vehicle (they did on mine) . I was told everything on the car had to be OEM. I had a mild build; ARK Grip exhaust, AMS intakes, AMS race HE, HKS blowoff valves, oil catch can and AUCar mark 6 infotainment console. The problem was the car would go into limo mode with a exhaust camshaft position sensor bank 1. The dealer replaced the sensor, then replaced the camshaft sprocket (pulled the engine for that fix) and even replaced the ECU. I was without a car for 6 weeks before they simply gave up and sent me packing.

I am just sharing my experience and I am confident when I tell anyone reading this post that you do not want to be in my position. I could not get the car fixed and was left to fix it myself. The problem was ultimately a failure in the main F-harness and had nothing to do with any modification I installed.

I think more importantly, that infiniti (corporate tech team) will not honor any AMS modification. I paid the premium for AMS products under the assumption that there was a partnership and certain AMS products would not void warranty. I can tell you that if they "choose" to deny a claim, they can and when I went back through the fine print I found that AMS clearly states that their products may void the warranty.

I hope nobody goes through I did because I was left holding the bag and was lucky I could solve the issue myself otherwise the car would have been only worth salvage value and it had less than 30k miles on it.

I'm not saying not to modify, I am saying do so with the understanding that you be land yourself in my situation if the stars are not aligned well...

I have read in many forums to take all non OEM parts off before taking the car to the dealer and I am confirming that advice.

Best of luck to everyone and make the best decision for you.