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a throttle body on its own will not do much....
you can add about 15% plus increase in hp over stock with the following combination:
-cold air intake AND 73mm throttle body
-performance exhaust, catbacks / x-pipe
-re tune of engine management system with tuner (diablo predator or equivalent)

you can search out these parts and details at
http://www.americanmuscle.com/?utm_source=yahoo&utm_medium=cpc&utm_term=american%20muscle&utm_content=american%20muscle&utm_campaign=YSM%2B-%2BS%2B-%2BSite%2BSpecific&OVRAW=american%20muscle&OVKEY=american%20muscle&OVMTC=standard&OVADID=30469236522&OVKWID=140393132522
(lots of other suppliers, lethal performance, summitt racing, more)

together these will provide a noticeable gain in your GT, individually not much.

additionally i suggest you swap in 3.73 gears in the rear end, will make you much quicker from the get go.

this is about the limit of "standard modificatiions" - beyond that for serious power your options are forced induction (supercharger or turbocharger), or installation of a nitrous kit.

cheers04 cobra
http://www.cardomain.com/member_pages/show_image.pl?image=http://memimage.cardomain.com/member_images/1/web/3169000-3169999/3169967_8_full.jpg?081519-289
 

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I believe they come with a 65mm or 70mm......i think its a 65mm.
Goto an autoparts website and look up Throttle Body for your mustang.....it will say the mm size.


BTW, DONT even bother upgrading to a bigger throttle body, this has been PROVEN a complete waste of money!

(think about it for a second...why get a bigger throttle body? That DOESNT change the size or flow patterns of the Intake Manifold, so it's kind of like increasing a pipe diameter, then squeezing it back down again, its truely pointless!

Goto ANY mustang message boards, they will confirm.

If you want to benefit from a larger Throttle Body, you MUST atleast Port your Intake Manifolds and Cylinder Heads first!
(which is alot of money....or alot of work if doing it yourself.)
 

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I would go with a 70mm BBK Throttle Body....some other good parts you can get to improve performance would include Cold Air Intake (good brands:JLT, BBK, Steeda), Underdrive pullies (good brands BBK, Steeda), Exhaust (brands way too many good ones)....check out www.mustangunlimited.com and www.summitracing.com for the best pricing on these items...GL!
 

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Mike is right.A Throttle body on a pretty much stock car is basically useless unless you are putting down some serious power n/a or you have forced induction you really wont benefit from a throttle body.
 
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