Squish is good for low-end and midrange efficiency.
If you're going nuts with boost, it goes down in the list of "to do"s
Your first priority then is to keep the engine from grenading after a few seconds of sustained full boost.
Squish is unfortunately the first to go in the effort to reduce the static compression ratio. You'll also probably need to go for thicker gasket AND lowest possible pistons AND copious amounts of water/meth injection AND 'safe' advance.
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