MaineMax97SE

I've got a 97SE 5spd. w/140K. I'm wondering if I should spend the money on mods or wait to see if I'll have to fix something first. The clutch & tranny still feel strong, no problems. Previous owner took care of the car and I have too. Then again it does have high miles. I want to spend the money customizing it but I guess I'm just worried that the minute I get a Y-pipe or tires and wheels, my clutch or tranny will take a dump. So should I go for it?
Thanks