Almost everyone on here will tell you gears gears gear...and their right The trick is which ones? Thats a thread in of itself. SFC's are a boring mod but necessary with gears. Smog/AC delete are good almost free mods (need bracket for AC delete). Bump your timing (free). Personally Im all about the exhaust mods. They may not give you the ripping HP for the buck you spend (its all about the heads) but 5.0's are ABSOLUTELY known for their sound. Even the chevy guys admire it. I say get an o/r mid pipe (X or H) and an after cat system of some sort. Just make sure you dont have to pass emissions before the smog/Off road pipe install...because you wont Lastly a mod that gets you approx. ZERO HP but I think is a ton of fun is a Short throw shifter. Pro 5.0 is my choice...nothing like rowing your gears with a satisfing click! Anywho good luck and have fun with it
Gears - 87-88 T-Bird Turbo Coupe rear axle - disc brakes and 3.55 or 3.73 gears in one package for $125-$300. Add another $100-$200 or so to complete the brake upgrade.
94-95 Mustang GT MAF - $40-$100. It is 70 MM instead of the stock 55 MM on regular stangs built prior to 94. It uses a slip on duct on the side that goes to the throttle body and a 4 bolt flange on the other. You need a flange adapter to fit the stock slip on air ducting that goes to the air box. Wiring plugs right in with no changes. *1 *2
95-97 Ford Explorer intake manifold & throttle body $150-$300. The intake manifold flows 220 CFM +, much better than stock. Throttle body is 65 MM, bigger than the 60 MM on stock stangs. I got a 96 with EGR passages that match the stock setup, so my smog gear works just like factory. You’ll need a 65 MM EGR spacer & new gaskets for $65-$90 so you have a place to mount the EGR & throttle linkage.
3G alternator from 94-95 Mustangs or other Ford. $20-$120. A must have to make the electrical system work like it should or if you have an electric fan. You’ll need a 4 gauge power wire and a 125-135 amp fuse to go with it about $15- $30.
Lincoln MK VIII electric fan -$40-$160. Free up some HP by not having to drive the stock fan. The 3G alternator upgrade is a must have prerequisite before you do the MK VIII fan. You won’t have enough electrical power if you don’t do the 3G upgrade.
Aluminum driveshaft: (courtesy of shawn13) It needs to be from a 92-93-94 Aerostar AWD and you will need the u-joint, part #353 from NAPA. It should bolt right up after the u-joint swap.
*1.) Metal flange adapter http://www.kustomz.com/cat3.html Buy the TR70 for $44.95. Or spend some time on eBay looking for one that may fit.
*2.) MAF & sensor interchange
The 94-95 Mustang 5.0 MAF & sensor is also found on:
1995-94 Mustang 3.8L F2VF-12B579-A2A,
1994-92 Crown Victoria 4.6L F2VF-12B579-A2A,
1995-94 Mustang, Mustang Cobra 5.0L F2VF-12B579-A2A,
1994-92 Town Car 4.6L F2VF-12B579-A2A,
1994-92 Grand Marquis 4.6L F2VF-12B579-A2A,
Evidently the –A1A, -A2A, AA, etc. on the end of the part number is a minor variant that did not change the operating specs. You should be able to ignore it and have everything work good.