Join Date: Nov 1999
Location: Where the Navy sends me...
Piecing together scraps of information from the thread title and your signature, I'm assuming you're asking about the M-5300-K springs? Looks like some additional parts are required to bolt them onto an '11 car.
They're not racing springs, they're street performance springs, so I'm sure they'll do just fine outside the track. The car certainly looks better with a less 4x4-ish ride height.
'89 GT convertible, N/A 357W, MM front susp w/425# coil-overs and Koni D/As, MM TA/PB rear setup (Koni Yellows, 390-430# springs), Stoptech 332mm / 12" Baers, MM 6 point rollbar, Maier 1.5" flared fenders & quarters, 18x9.5" front/18x10.5" rear Enkei RPF-1s (street), 18x10" CCW C-10s (track), etc...