I have one my friend did have one it and he when to the track with it and it was about .1-.2 from what the track said he was doinf the MPH was about 3-5 more most of the time. He liked it. 
PS be safe If you get it
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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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