I think they do but im not sure. Jesse you should ask over on the LS1 board, I know a lot of those guys head out there quite a bit.
104mph + stickies = 12.9
Sky
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-1989 Saleen Mustang #406- TFS Heads, E-303, edelbrock intake,70MM TB, 73mm MAF, off road H, headers and 3chamber flows.
12.55@107mph
Going for 11's on 87 octane with A/C and 20+MPG!!!