and can l put more speakers in it aftermarket the SUBARU LEGACY 2.5i LIMITED SEDAN
and HID is headlights

l have a '96 Legacy. It has 142k miles on it and still runs reliably and looks pretty good.

i dont know about the gps. that may need to be added aftermarket.

At http://subaru.com, the only place l see GPS for a Legacy is the car u r looking at. ''Touch-screen GPS Navigation System Package (optional with 2.5 GT Limited Sedan with automatic transmission only).'' It is not available with any standard transmission & it is not available with the wagon.

Of course, u can buy any aftermarket GPS (TomTom, Garmin, etc.) & add them yourself. Many people prefer to do this, because the Subaru option costs $2,500 & portable GPS units start at under $500. You can find reviews of various units at ! Shopping or Amazon or Consumer Reports.

Our son has a TomTom & loves it. Plus - it can be used with Bluetooth as a handsfree device linked to ur cell phone.

l will let others answer about longevity, but Subaru certainly has a reputation for long life cars.

What year is your Legacy? If maintained properly l have seen Subaru is with over 200,000 miles on them. l have a '93 with 188,000 miles. Check to make sure any after market parts especially electrical will not void the warranty. Read the manual and check with your dealers service manager on that and have him give you it in writing. l used to ba a service adviser at Subaru shops and have seen Subaru void warranties for after markets parts.