Yes, you can use the car until you tune. The rear O2 sensors are turned off with a tune so you don't have to do anything.
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Performance Mods:
Kooks 1-7/8 LTs; Calico coated w/HFCs, Solo Mach XL catback w/J-pipes, VMax TB, C.A.I. Intake, JRE Tune, RX Catch-Can
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