Sorry About that But they say that they do on there web Page.....they should change it...If they dont realy have 3.90........ 
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Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe
Drive Train: 3.55, T-5 with a Pro 5.0 shifter
12.656@107.71MPH See It at www.T-racing.com/mustang.htm
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