1.8 GSR TURBO HEDDERS THATS ALL

I WANT TO MAKE MY CAR FASTER, I ONLY GOT ON IT A K&N TYPHOON COLD AIR INTAKE , AND I WAS THINKING ABOUT UPGRADING THE EXHAUST ON IT……….BUT WHAT ELSE CAN I DO WITHOUT SPENDING A WHOLE LOT OF MONEY LIKE IN A SUPERCHARGER OR A TURBO??? WHERE CAN I GET A PERFORMANCE CHIP FOR MY CAR?????

E.g. no turbos.
The car is completely stock except already has new tyres / rims, and exhaust.

the nissan 1988 s13 silvia 2.0l stock non turbo manul vs the vs honda prelude b20 non turbo manul stock 1988 also non vtec thats for you help