the car will turn in quicker with the sport rack, lock the steering wheel and unhook the battery so you don't fuck up your airbag, and make sure your new rack is centered before you install it turn it all the way left then all the way back right and coun the turns then go back exactly halfway to get it close. Your going to need an alignment...
that should cover the rack
check all your tune up parts on the higher rpm misfire plugs may need regapped or replaced could be a weak coil, or a dirty distributor cap, clean the maf, and have the control module tested
I think that covers it all
good luck