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From the
SP Engineering website:
"SPE900 LP640-TT: The Rebirth
Our complete twin turbo upgrade kit for the LP640 has successfully been installed once again. Adding an additional 300+awhp to this beast is enough to speak for itself. All the while the LP has been able to keep its beastly roar from the V12. Needless to say our client is happy with the power gain as well as our attention to detail of the installation."