For IRS upgrade recomendations, read my IRS Tech Article. http://www.svtperformance.com/forums/showthread.php?t=213384 As far as putting an IRS in to a SN95, I have not personaly done it so I can say for sure but I have read it is fairly streight forward. Just search this board and the internet for info. Her is a link to a guy that did it years ago. I havent talked to him in a while but he may be able to help you out. http://home.flash.net/~ivc1/cobra/stang.html
As for the rear brakes. If I recall correctly they used the SN95 SRA cobra brakes in the IRS. So your calipers are not the same but thay may work. If you cant make the calipers you have work it shouldnt be too hard to track down a set that will bolt up. Plenty of people have done brake upgrades and have stock parts sitting around. Just search the market section.
As for brake lines I dont know if your lines will reach or not. If they wont pick up a set of Russell stanless brake lines. http://store.summitracing.com/partdetail.asp?autofilter=1&part=RUS%2D693270&N=700+4294907915+400081+4294882683+4294902061+4294924641+115&autoview=sku I run them on my car and they are great. As for the 03 Coupe springs, yeah they will work just fine. They will give you a harsher ride than your stock springs because of the higher spring rate but they will work very well.
If you need anything else just ask.
Kyle
As for the rear brakes. If I recall correctly they used the SN95 SRA cobra brakes in the IRS. So your calipers are not the same but thay may work. If you cant make the calipers you have work it shouldnt be too hard to track down a set that will bolt up. Plenty of people have done brake upgrades and have stock parts sitting around. Just search the market section.
As for brake lines I dont know if your lines will reach or not. If they wont pick up a set of Russell stanless brake lines. http://store.summitracing.com/partdetail.asp?autofilter=1&part=RUS%2D693270&N=700+4294907915+400081+4294882683+4294902061+4294924641+115&autoview=sku I run them on my car and they are great. As for the 03 Coupe springs, yeah they will work just fine. They will give you a harsher ride than your stock springs because of the higher spring rate but they will work very well.
If you need anything else just ask.
Kyle