Tuning my 4efe 1st time

[4efeNON-Turbo]

Hello Everyone,

I just bought a toyota starlet year 1998.
It has a 4efe engine 1330cc.
It's fully stock. Only 14 inches rims.

I don't want to add a turbo.

May I please have some tips to get more power ? I want to keep it naturally aspirated.
I think iridium spark plugs will give me some power, are there other parts I can change or add ?

Thanking you in advance for your help

[4efeNON-Turbo]

I did some research on my own.
I found that these may help :

- new manifold 4 2 1
- lighter pulleys
- plane the culasse(I think it's cylinder head in english)
- use sport Cylinder head gasket
Then the light mods like air filter and spark plug.