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Drops ins should be safe to at least 1000rwhp, provided plenty of fuel. Would be good to max out your whipple. I think you have a more costly fuel barrier to overcome at those levels. Might need either the addition of port injection system or go heavy duty on the direct injection system,. Really depends on how much meth you're going to use AND how you intend to use it. GPI seems to get lots of attention on their drop ins.
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