size would be the only thing that matters when you are looking for any kind of heat exchanger. a cheap one works as good as a really expensive if it is the same size from my own testing. mounting it may just be up to you as it may be universal.
Ive seen kits go for as much as $1200.00!!! and the efficiency was just as good as a pair of generic auto-parts shop ones that were $40.00 each. if your up to gathering all the hose and fittings your self this will save you a ton of money and will work just as well.
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