First, I drive an '88 Thunderbird (Fox body of course), and there's a lot in common with the Stangs, some differences. Not a real heavy car like some think (accurate weight this week)....now, about the performance, I haven't been to the track yet, but, I can tell that it easily out performs my last engine (as stated above, '86 short block,BBK's,E303. ported E-7's and Explorer intake with 65mm t-body). The car pulls really hard through all the gears (5 speed0,and can easily roast the rear tires without even breaking a sweat, and I have 275 40 17's out back. Traction is a must. It loves to run hard, and even when I'm driving the Sport like I stole it, the engine seems to thrive on it. I need to ad some 24# injectors though. I ran out of funds for a Mass Air meter and injectors (bought sound deadener for the entire car and had the a/c hooked up and running cold). I did mange to install the Crane Gold 1.7 roller rockers last Friday,and I could tell the difference between those and the 1.6 rolers I had on there. I have a 2 1/2 inch exhaust (no cats), using a Pype's O/R X-Pipe and 40 series Flowmasters....for now. Those mufflers are going away and I'm going to get some with a little less drone. It really will sit you back in the seat easily and put a smile on your face. LOL. If you have any more questions,let me know.