What rear springs to run?

SS springs are for hooking your launch with the right slicks on the back, along with all the other tuning for that.

XHD springs came on many of the GT type models and i've never heard anyone complain after they got them... ;)

there are aftermarkets, but really to me it's not the looks that matter so much. you could nit pick all day about too high too low yadi yadi yadi but what matters is that they work the way you want for the type of driving you do.

SS = great for drag
XHD great for street
autocross = i've heard of people using 2 of the drivers side SS springs haha

it's all what you want. again, i wouldnt worrry too much about looks rather look at what works best. if you are carrying passengers around a lot you probably want that extra 1" have them sit in the back then it looks perfect lol

you can also spent 1k or 2k for a fancy setup in the back end but you probably wont notice a difference unless you have a 700ft/lb drive train and are doing too many wheelies at launch and you want to keep the front down