Ford Racing Performance Parts 65mm Throttlebody
OVERVIEW
One of the easiest modifications you can do to your 5.0L Mustang is upgrade the throttlebody.  Like any modification, you'll only notice a power increase if the stock part is a restriction.  The 60mm throttlebody isn't a huge restriction until the power level is increased substantially.  It is a restriction none the less so replacing it with a bigger unit will yield more power.  But how big should you go?  Like with the carburators they replaced, going with a throttlebody that is too big will kill power and driveablity.

For an everyday naturally aspirated street car, the FRPP 65mm Throttlebody is hard to beat.  This unit costs a little more than some of the other choices, but it comes with a new Idle Air Bypass and Thottle Position Sensor.  Otherwise, you'll need to swap the stock parts from the stock throttlebody.

The stock 94 and 95 5.0L V-8 came stock with a 60mm throttlebody.  There is wide misconception that the SN-95 Cobra came stock with a 65mm throttlebody.  This probably stems from the fact the 93 Cobra came stock with a 65mm unit. 
TOOLS NEEDED AND DISASSEMBLY
TOOLS
1. 13mm socket
2. 6" extension for socket
3. Ratchet
4. Flat head and Phillips screwdriver
5. Hex wrench to remove STB (as necessary)
DISASSEMBLY
1. Remove the strut tower brace, if equipped
2. Use a screwdriver to remove the intake track (at least the rubber elbow from the throttlebody to the MAF.
3. Gently disconnect the Idle Air Bypass and Throttle Position Sensor (see picture)
4. Remove the throttle cable, cruise control cable (if equipped), and the throttle spring (see picture)
5. Use a 13mm socket and 6" extension to remove the 4 bolts holding the throttlebody to the upper intake.
6. Pull throttlebody off and scrape the old gasket off of the upper intake.
REASSEMBLY
1. Fit the new gasket over the four studs (trim as necessary)
2. Slide the new throttlebody over the 4 studs and tighten the 4 13mm nuts.
3. Reconnect the IAB and TPS
4. Reconnect the throttle cable, throttle spring, and cruise control cable.
5. Reinstall the rubber intake track
6. Reinstall the strut tower brace, as required.
IMPRESSION AND DYNO RESULTS
The FRPP 65mm throttlebody did not add much to the wide open throttle seat of the pants feel.  It did add some to the part throttle feel.  On the dyno, the FRPP 65mm throttlebody netted 3-5 hp across the RPM range.  Overall, it is a very easy modification, and worth a few ponies.  I would recommend doing it after the upgrading the MAF , underdrive pullies, and the catalytic H-pipe.
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