Hi guys. Having been searching for awhile to make some performance improvements with a GF 626 Sedan. Any advice on accessories or modifications to make it handle/increase a bit of power?

Is it aski8ng a bit too much of this model?

149,000kms

5 Speed Manual

Thus far have done:
K&N Air Filter
Fuel Filter
Taken Injectors out and Cleaned
Nolathane front sway bar
205/55-15 Bridgestone 003
CRC Air Intake Cleaner clean
MAF sensor and Throttle body clean
4 new Monroe shocks

Would new springs be of any advantage than the originals?

Also, cannot find any Nolathane rear swap bar bushes anywhere....can't believe it!

Would appreciate your advice