So I finally after all of these years installed an intercooler. This is a factory one from a Mitsubishi Pajero. The install was pretty easy, I just had to bend the two brackets that bolt to the core support a little and make a bracket for the rear to mount to the fire wall.

There is a noticeable power difference and I picked up another 5psi of boost.

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99 Montero SR
Mazda B2600i with 4D56T diesel swap