I absolutely love my turbo 4runner! I've sunk some money into it. garrett turbo, rebuilt the engine, intercooler, and what not. Although I love it, the money I've put in it and the money i see putting in it in the foreseeable future is kind of ridiculous to think about.
I can feel a huge difference in power going up hills, etc. because I chose a turbo that responds well at higher rpm.
Mileage is slightly less because of my modifications. The ECU doesn't really understand what I've done and so adds more fuel as a precautionary measure. If you keep it stock, you shouldn't have this problem. If you don't keep it stock, the only answer is to get a new stand-alone computer like MegaSquirt.
[/QUOTE]reliability? longevity? power? mileage?[/QUOTE]
like anything, if it is/has been maintained, it'll be reliable.
One notorious problem these trucks have is the exhaust side of the turbo cracks not allowing it to build boost. The cause behind this extremely small exhaust and the owners of the vehicles not allowing the turbo to cool down enough before turning the engine off.
Power? as said before, if the stock turbo still works you'll be able to tell. If it doesn't, then you will still be able to tell. With no turbo it's like driving a low compression 22re.
From what I know, they are "suppose" to get similar mileage.