The lip is for a better turbulent zone after it, therefore creating more pull of hot air out of the engine bay, IIRC. It works for me!!!
JasonS
2000 SVT #1119
Go: SHOshop Intake & y-pipe, Brullen exhaust,
Eibach springs, EBC TurboGroove rotors,
Corbeau seat, TRW 5pt Harness
Show: Knauberized, Clear corners
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