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If you're using it without any engine management, it'll help, but it's not going to be optimal. When you use it, it's going to affect your tune. I'd pull some fuel when it's engaged. It'll cause some richness due to the affect it's going to have in intake temps.
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P&L tuned 2007 WRX TR
301 awhp / 337awtq
It's like 10 lbs of shit in a 5 lb bag...
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