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the infiniti Q45 has this system stock. It's nice but I wouldn't spend my money on adding it.
On my last set of tires I had them filled with nitro. The nice thing about nitro is you don't get the swing in psi from cold to hot. It holds the psi at what it starts at.
Since doing the nitro I hardly ever check the psi anymore because it's right where I want it. 43psi.
When I travel or plan to travel more than 5hrs on the freeway, I run by and they bump me to 48psi.
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