You're talking about boost enrichment now. I know quite a few guys who did that on their turbo sandrails. Seems to me that in the long run it would be more work as you always have to keep an eye on the methanol level (it would be bad to be hauling ass across the lake and have the enrichment system quit or run out), not to mention it's one more system to watch. At the same time, you're sitting in a big pond of water, I'd opt for the intercooler.