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Well the ZL1 itself was built with cooling in mind. I think the Whipple 2.9 is the way to go. The extra displacement will mean more boost without having to spin it as fast as the smaller 2650s thus keeping the heat down. Of course a centri setup would be cooler than any PD. But between these I'd take the Whipple. Or whichever is the cheapest, lol!! They're all capable of delivering more power that the stock heads and cam will allow anyway. And they'll all cool efficiently. So if you're not planning on doing a cam or heads then get whichever one gives you the better deal.
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