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I live at 6700' out in the East Mountains, so I feel your pain. There is no good answer for getting back that 20%. You can always turn up the boost more to make up for the difference, but even with a 100% efficient intercooler, you will still run into the 91 octane problem and therefore still make less power than people running the same absolute boost pressure on 93 octane. There are a few E85 stations around ABQ, so if you are in town, that would help.
There is no difference at high elevations for the S/C versus the turbo argument -- that is, the arguments for S/C versus turbo are still the same arguments. The same rules apply as apply at sea level except that now you have to run more boost to make the same amount of power. As always, the turbos start looking better and better the more boost you run, and so that would be an advantage for the turbo IF you are turning up the boost further to get back that 20% loss.
In a nutshell: both setups will be running higher effective pressure ratios, and so yes, the turbo will spool slower. But the S/C will have similar issues.
Having said that, you could just accept your 20% loss, get the turbo or S/C kit, and have fun. At 8 psi boost in ABQ, you'll still be making significantly more power than a stock engine at sea level.
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