We used a mid-length socket on mine. The deepwell was a hair too long with the swivel, and the shallow socket wouldn't fit over the stud. They're not too hard to find, picked up a single one at Sears for like $5.
a mid length socket would work best but i managed with a 15mm deep socket doubled with a 3/8 swivel and about a foot and a half of extensions. i removed the sway bar underneath of better access (it's only held on by 2 bolts. also lather the bolts up with penetrating oil (works better than just plain old wd40) and put a lead pipe over your ratchet for better leverage. takes patience but im a 18 year old kid and got it done so i'm sure you could.
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Procharged 2002 Mustang GT 5 Speed 351rwhp 353rwtq at 10psi
Next summer looking to go with:
Bilstien shocks + struts, Lowering springs (brand still TBD (any suggestions?)), MM CC plates, front + rear sway bars, subframes, and upper and lower control arms.
Time to make the pony ride some rails
it was about 5 years ago that i did mine, but i do remember there were a few universal sockets an extension and a 12 pack of Budlight involved ... it was a PITA though, I do rember that.
Make sure you seal that bugger up when you put the new on on also... I had a problem with it leaking...
01 GT Vert...Black and Tan
CURRENT MODS: JLT Ram Air Intake, UPR o/r X pipe with JBA mufflers and 2.5 in. pipe w/ stock tips, UPR black anodized shift knob w/ OD button relocation kit, B&M tranny cooler, 35% tints all around, Mach 1 chin Spoiler, Red Calipers, Stainless bumper letters, custom badges, Pioneer AVIC-F700BT Touch screen Navigation Unit...more to come
Just crank them down really tight it is a PITA! It took me hours (I kept having to go buy things lol). Well worth it in the end. Much easier on a lift if you have one.
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Current mods: Flowmaster 40s, O/R Prochamber, K&N filter, Proffesional products 75mm plenum, diablosport tune, 3.73s, MGW shifter, Fidanza 2.1 clutch, Roush lower control arms, 17x9 GT500 wheels, 2003 Cobra bumper, 10th anniversary Cobra brake kit, white face gauges, 8 in. shorty antenna, bumper letter inserts, 4.6L V8 hood scoop decals, XM radio,
Next mods:
MM panhard bar, V3-Si Vortech, Comp XE270AH cams
i finally got it off thanks alot everybody now im having trouble getting the O2 sensors out they have been in there so long anyone have any ideas on a good way to get them loose
penetrating oil, a wrench, and some muscle. it's easiest to disconnect them first then get them out when the mid pipe is out.
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Procharged 2002 Mustang GT 5 Speed 351rwhp 353rwtq at 10psi
Next summer looking to go with:
Bilstien shocks + struts, Lowering springs (brand still TBD (any suggestions?)), MM CC plates, front + rear sway bars, subframes, and upper and lower control arms.
Time to make the pony ride some rails
use a long screwdriver to push in the clip then just pull on it. swap sensors when both mid pipes are off, then line up sensors and push them back in with the long screwdriver to secure them with the little clips they have
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-2002 mustang gt
borla stingers, K&N fipk, accufab 70mm throttle body, accufab intake plenum, steeda 4-bolt caster/camber plates, tokico illumina shocks/struts, H&R SS springs, '04 cobra spoiler, '04 cobra side skirts, '04 mach 1 hood and shaker, '01 cobra front bumper
-2000 F-150 V6
k&n drop-in filter
mid pipe help!! 
... it was a PITA though, I do rember that. 
