I described my set up in detail in this thread: http://www.volvoxc.com/forums/showth...sh-From-Bottom
I'm a fan of the "plate-type" coolers. They're both more efficient and more damage resistant than the tube and fin type.
I went pretty far with the setup on that car, anticipating hard mountain use and teenage drivers. I installed an external filter, and then a thermostat.
Just a cooler in the radiator-transmission return line is what I did on my wife's XC. That's a big improvement over OEM.
Depends how sophisticated your customer wants to get. I will say that my Tundra has both a huge cooler and a thermostat for the transmission cooler circuit, and it's set up for serious towing. It's got a tube and fin cooler, but way, way more robust than the aftermarket ones available.
Amazon has good prices, and shipping, on all the parts that I used for my set-up. When I plumbed in all the stuff, I had to add over 1.5 QTs to get the level correct. A surprising capacity increase.
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (126K, Michelin AS4, HPL 0W40)
2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
2004 V70R (143K, six speed M66, HPL 5W40)
2004 XC90 (235K, HPL 0W30 Euro)
2002 V70-XC (295K, HPL 0W30 Euro)
2002 V70-T5 (225K, IPD bars, Bilsteins)
2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)
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