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40 is around what these cars would see at part throttle or just cruising around on the street because there is less air going into the engine so it is ignited earlier..
W.o.t. or during your peak hp and tq rpms it will be alot lower like 19-24 depending on the year of the car
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2002 Z/28 = Firemutt Racing 370 w/ Cam, Trick Flow heads, TPIS 90mm Intake & 90mm T.B., Vigilante 3600 t.c., Michael's Transmissions Built 4L60E.
QTP Headers, Mufflex Stainless Y-pipe, Pypes Performance Exhaust, Moser 12-bolt w/ 33 spline axles,Truetrac & 3:73's., Spohn.
Cartek Tuned...
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