Bassani is probably going to tell you to cut the tabs off the o2 sensor harness. I don't think there is a specific extension for our cars. If they sent you a 4 wire harness they sent the correct one. I did my longtube install this past saturday and had to do that also. Good luck finishing your install.
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07 GT, Whipple H.O. genII, VMP tune, 471 hp and 473 tq, Mcleod RST, Roush tensioner, Kooks LT's w/catted X, Frpp stingers, 3.73's, MGW, Steeda ultralites, Roush RR03 18x10's, 11.67@119
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