I have a 96 so none of the 'explode it tight in a crash' tensioning. IIRC the front belts on the husband's 99 does have it.
I pulled apart a rear belt mechanism because curiosity. Though from searches others have had some luck with altering the spring so it worked better, from that personal experience I wouldn't recommend it unless as in my case you have a replacement in the wings-
it was not easy to put back together and that spring is a bad word and the locking mechanism is recalcitrant and it worked about the same after I was done. After all that I'll eventually get around to just replacing the front belts when it gets annoying enough.
I did find it to be interesting to do though. The housing on the 96's is clear plastic so a lot of the action can be either seen or surmised without its being taken apart.