I run the MM full-length subs. They're about 20% stiffer than the standard length. If you plan on doing any twisty-turny racing, you need them. On a street car, the standards are ok. Also, The '94-up SN-95 chassis is somewhat stiffer than the Fox platform. So they don't need as much help, at least on a street car.
The full-length subs reach from the firewall to the rear torque boxes. They also come with gussets, so welding takes more time than the standards. If you're paying someone else to do the welding, budget for the extra labor.
------------------
Moxie Racing
The Nitrous Oxide Information Site