ACC-462VPLENUM - Accufab Upper Intake Plenum for 1996-2004 4.6 Liter 2V Mustangs, Fits 70 or 75mm Throttle Bodies
Do you have a SN-95 1996-2004 Mustang GT?
Does it have the stock plenum? It shouldn't.
This Accufab plenum is what Ford should have put on in the first place. You'll get a increase in horsepower and torque all throughout the power band (about 10hp and 15ft-lbs of torque), and it outflows the stock plenum by over 33%.