I want to change the suspension and add the HID in my Mustang.
who knows what kinds of suspension should i install.. and can Mustang install HID headlight?

What kind of mustang do you got? A good basic suspension setup is the Bullit suspension that comes stock on the Mustang Bullit. Its affordable you get matched springs, shocks and struts for like $340. ThatsTokico shocks with 600lb springs front and 250lb springs back. Its what I have on my cobra and it handles great, dropped ride height by about 3/4 inch. And after that, upgrade the bushings and throw on a panhard bar to tighten up the rear.
Not sure if they make HID lights for the mustang, but a good upgrade is the cobra lights. They consist of clear lenses and are about twice as bright as the GT and V6 lights.

My mustang is 2002 GT i don't know what kind of the suspension and ....actually i want to improve the handling...and low down the car..

Springs will lower it, If you really want to improve handling, Find a used IRS rear

The Bullitt suspension would be a perfect match, improve handling as well as drop ride height by about 3/4".

How much the Builtt suspension set?

I'll sell you mine...

:licker:

errr, maybe not.

heh.

The Bullitt handles and feels nice on the road. Unless you want to dump alot of money into your suspension pieces, I'd say just get a bullitt setup. Check out www.IMBOC.com

Its about $340 check it out http://www.gefracing.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=GRPP&Product_Code=BULLITTSUSP&Category_Code=BULLITT

Thank you ...